We don't blame him!

Rob Kardashian is none too pleased about his sister's insensitive comments about him in her recent Rolling Stones interview, where she basically called him lazy and worthless, and now the USC graduate is letting her know!

"Rob and Kim had been cool again and were getting along. Now he’s furious at her again for her comments to Rolling Stone. He has been bitching her out on her phone. He’s mad — pissed as hell," a source dished to Us Weekly.

In case you missed it, Kimmy K majorly dissed her younger sibling when asked about his struggle with depression and weight gain, and his distain for the public eye. "It’s not that mysterious, what’s happening with Rob. 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 told the magazine.

It sounds like Robby is never going to get over it, either! "Rob has blocked Kim on his phone. 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," the source added.

Team Rob!