Kourtney Kardashian Says Rob Threatened to Slam 'Disgusting Family' Over Blac Chyna Chymoji Drama

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Rob Kardashian didn't appreciate getting yelled out by his oldest sister, Kourtney Kardashian.

In a preview clip for Sunday's Keeping Up With the Kardashians, the mother of three is disturb by Blac Chyna's Chymoji of a girl getting slapped that looks strikingly similar to Kylie Jenner. Rather than expressing her grievances to Chyna herself, Kourtney tells her beauty team that she called and fussed at her 29-year-old brother, who's engaged and expecting a child with the 28-year-old model.


WATCH: First Look at Rob Kardashian and Blac Chyna's Reality Show -- and Their Big Argument

"Everything with Rob, I always try to be super calm but I was just like in a mood," she tells her makeup artist Mario. "So, I was gonna call Chyna and then Kylie was like, 'No just call Rob, it's too crazy to call Chyna.' And I'm like, 'I don't want to yell at a pregnant person.'"

Kourtney -- who was happily hanging out with her brother last week --- confides that she's given Rob's fiancee the benefit of the doubt in the past, but now has to "question Chyna's intentions."

WATCH: Rob Kardashian Spends Family Time With Kourtney and Khloe -- See the Sweet Snaps

The 37-year-old reality star also explains the drama to her sister Khloe Kardashian, and reveals the threats she received from Rob. Kourtney claims her brother told her, "I'm gonna go on the red carpet tonight and I'm gonna tell everybody how I have the worst, most unsupportive, disgusting family."

Meanwhile, Kylie -- who is dating Tyga, the father of Chyna's son King -- doesn't seem fazed by the Chymoji. "There's so much misunderstanding going on," she said in a previous KUWTK promo.

MORE: Blac Chyna and Rob Kardashian Send Kylie Jenner a Sweet Birthday Card -- ‘I Love You More Than You Know’

On Wednesday, Chyna and Rob did their first Facebook Live chat and revealed quite a bit about their wedding day and parenting plans. Rob even answered whether he plans on giving his child-to-be a "K" name. Check it out:

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