TS making shit up. They talked to him and weren't confident about his ability to understand instructions in English. And let's be honest, it's not like Khabib's English is impeccable, especially in an emergency situation under pressure. He can understand his corner men, because they use MMA related terms 1000 times a day. I've never sat next to the emergency exit, but by all accounts, they give you a shpiel that you need to respond to. If you don't give them 100% confidence that you can communicate with ease, you're out. They weren't confident he could understand complex instructions in that context, so they asked him to move. The guy chose to get off the plane.
The girl says "It's not about your English," because she's explaining that it's not about your own idea of whether your English is good or not, or what makes "good" English, because that's subjective. It's about the flight attendants' determination, and that's final. So there's no argument to be had about your language skills, it's either you move according to the determination, or you get off. Which is fair. The accusations of anti-Muslim are the funniest. Most people who look at Khabib without following Dagestanis in MMA wouldn't guess he is a Muslim just by sight, he looks like some crazy mountain dude from some unknown place. And if they were anti-Muslim, why would they tell him to stay on the plane, but change seats? They think he's going to hijack the emergency exit specifically, but are OK with him sitting somewhere else? Such a stupid argument. I don't see the airline doing anything wrong, lmao.