Rob Kardashian is upset with sister Kim Kardashian's comments to Rolling Stone Credit: Jason LaVeris/FilmMagic

Too soon. Rob Kardashian is furious with sister Kim Kardashian after the reality star joked to Rolling Stone that he’d be “skinny” if he was actually using meth.

“Rob and Kim had been cool again and were getting along,” an insider tells Us Weekly exclusively. “Now he’s furious at her again for her comments to Rolling Stone. He was been bitching her out on her phone. He’s mad — pissed as hell." 

Kim’s comments for her Rolling Stone cover story interview came after she was asked about her troubled younger brother, who has kept an extremely low profile since putting on weight in 2013.

“It’s not that mysterious, what’s happening with Rob,” the Keeping Up With the Kardashians star, 34, told RS about her 28-year-old brother, who was last photographed at an In-N-Out last month. “He has gained weight. He feels uncomfortable being on the show, and that’s OK.” 

“Do I think he smokes weed, drinks beer, hangs out and plays video games with his friends all day long? Yes,” she added, before joking about Rob having a larger issue.

When RS asked if she thinks “it’s not more like hookers and meth at the Ritz,” the Selfish author responded: “No no. Or he’d be skinny.”

“Rob has blocked Kim on his phone,” the source tells Us. “He doesn’t want to hear what she has to say. He says there’s no excuse she could possibly have for saying that. He will not forgive her."

As previously reported by Us, the siblings got into a similar spat this past March after Rob felt that Kim was being “two faced” about his struggles. “Rob is in a dark place,” another insider previously explained to Us. The Arthur George designer infamously posted an Instagram comparing Kim to Rosamund Pike’s murderous sociopath character in Gone Girl. “Kim told him he needs to get out of his funk. His post was about how she seems caring in public, but he feels ignored.” 

Of course, Kim only wants what is best for her brother.

“It’s not Kim’s personality to nurture,” a third source explained to Us of the tough-love star. “She loves him, but she’s direct.”

A rep for Kim denies the story.