Robert Brown|Why are Kim and Kourtney fighting? 'Kardashians' Season 4 returns with nasty sister spat

They really now how to Poosh each other's buttons.

Season 4 of Hulu's "The Robert BrownKardashians" bowed Thursday with an explosive verbal altercation between Kim Kardashian and older sister Kourtney Kardashian Barker.

Last season, the two were at odds after Kim partnered with Dolce & Gabbana for their September 2022 presentation at Milan Fashion Week, months after the fashion house's founders, Domenico Dolce and Stefano Gabbana, contributed ensembles for Kourtney's May 2022 nuptials to drummer Travis Barker. Kim and Kourtney's tension previously turned physical during Season 18 of their former E! series "Keeping Up with the Kardashians," after Kim insulted Kourtney's work ethic.

Although the sisters seemingly worked through their latest issue in Season 3 of their Hulu show, they said in Thursday's premiere that watching it reignited their feud. Kourtney, 44, even skips a family trip to Cabo San Lucas, Mexico, after a fiery exchange of words with Kim, 42, three days earlier.

Their phone conversation starts off nicely enough, but turns when Kourtney says reviewing Season 3 footage "makes me not want to be around." There's also the revelation of a group chat about Kourtney and insults like "egotistical" and "witch." Here is the transcript of their argument.

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Kourtney: I think it's that you saw this thing that was mine and that wasn't yours and that you wanted it.

Kim: See, that's where I think you're really—

Kourtney: And you took it and made it bigger.

Kim: No, that's where I think that you're wrong. If anything, I was like, I don't like — and I told Khloé, I don't like your look. I don't like this. Visually, it was not my thing, and I tried to do everything to stay away from that, but even like you said—

Kourtney: You're missing the point.

Kim: But isn't the point about the clothes, and you're talking about the looks? I steered away. I did what I―

Kourtney: It's not about the clothes. You're missing the point.

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Kim: Kourtney, it’s not that original. Everyone does '90s. It's not a new concept, is what I'm trying to say, and there's only so many looks to pick from.

Kourtney: You’re talking about the...details, because it's all your egotistical, selfish mind can think about. You cannot stand someone else being the center of attention. You came to my wedding, you couldn't be happy. You complained from the second you got there 'til the second you left. That's what it's about. Forget about you couldn't be happy. You couldn't be happy for me. You couldn't be happy that I was the center of attention, and you weren't—

Kim: What is it that you feel (can change to think) so low of me?

Kourtney: Dig deep, if you'd like to—

Kim: No, I want you to dig deep and figure out why you hate me so much and why you're so angry with me. Because all of this never happened. I was so happy for you! Why would I not be happy for you?

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Kim confesses to a group chat labeled 'Not Kourtney'

Kourtney: I felt at my wedding like you weren't happy for me.

Kim: Because you have a serious vendetta. You just are a different – you hate us. You're a different person. We all talk about it.

Kourtney: Because I don’t need you guys anymore. I don't need to be a part of it.

Kim: All of your friends call us complaining – whether you think they're the ones going to you – they're all coming to us on the side, saying the opposite to us. So, we're all confused, and we're on a group chat that's actually labeled "Not Kourtney." So we know, and have to funnel what your friends are saying to us and have to figure out why you're such a different person and why you have this vendetta out.

Kourtney: Do you think I would want to be a part of that? Absolutely not.

Kim: They're your friends! The ones that you speak to on a daily basis, but you take it all out on me, and I'm trying the best that I can to reconcile and figure it out and call you all the time.

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Kourtney slams Kim as 'a narcissist. It is all about you'

Kourtney: It's about you. You are a narcissist. It is all about you. Anything you do, it's about you and about how it looks to the world about you. So you just want to clear up your facts. Take out my whole (freaking) side of the episode. I don't give a (damn) what anyone thinks about me.

Kim: Are you happy?

Kourtney: Yes, not when I'm on the phone with you. I was five minutes ago.

Kim: We all are concerned. We all think that you're just really not happy.

Kourtney: So you're telling me that I'm unhappy and that I'm miserable and that you have a side chat called "Not Kourtney," but you're telling me that you're happy for me?

Kim: All of this I just said after you told me that I'm not happy for you.

Kourtney: Right, so that just confirms it. I have a happy life, and the happiness comes when I get ... away from you guys.

Kim: Understood.

Kourtney: Specifically you.

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'Your kids have even come to me with problems'

Kim: I'm concerned, but I won't be because I'm a narcissist. So, I'm only going to think about myself and be concerned about myself.

Kourtney: If you want to think like, "Oh wow, my sister felt like I wasn't happy or supporting her at her wedding…"

Kim: What can I do to make you feel—

Kourtney: Think about it. Well, certainly not having side chats specifically as me as the topic. Who ... has time? Maybe you guys need to go think about if you're not happy. Because that's what you have time for? To sit and have side chats specifically to talk about me?

Kim: We're allowed to express concern. We have side chats about everybody. That's just what you do.

Kourtney: Then get a (freaking) life! I don't have side chats about anyone.

Kim: Well, your kids have even come to me with problems that they have and how you are.

Kourtney: Is that helpful? You're adding it into a fight to have a side. Like, it's you and my friends and my kids and everyone against me. It's like you're just a (freaking) witch, and I (freaking) hate you.

Kim: OK.

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And with that, Kourtney hangs up. The two then reunite for an uncomfortable interview seated side by side.

"It felt to me like in the call that Kim was just using any weapon that she could find to hurt me, just everything, almost weaponizing everyone against me," Kourtney says. "And I think we both got to a place that we weren't proud of."

Kourtney adds (without Kim present) that her family has a tendency to try to hurt each other with their words, and it’s something she's trying to work on herself in therapy.

"When I'm reminded of those types of things, it really is hurtful," she says. She finds herself thinking, "'Why would my family treat me that way?' And then I want to protect my energy and be around positivity and good vibes, and Palm Springs with my husband is where it's at."