Blac Chyna has a word for Rob Kardashian's haters. Quite a few, actually, and Rob's controversial new girlfriend shared them on Tuesday in a series of Snapchat videos."Alright so, I go on Instagram and my snapchat and people's talking shit about Rob. Right, you weak-ass bitches," she says in one, while enjoying a green lollipop. "What's crazy is like, you bitches are so fucking concerned. Worry about yourself, worry about your fucking account," she helpfully suggests. She adds that Kardashian has "been like low-key for three years, and y'all bitches ain't about to run him back in." Rob has stayed out of the public eye for the past couple of years as he dealt with health problems. But in recent weeks, he’s emerged on social media and, to much controversy, started dating Chyna, who was recently arrested