I hadn't seen that clip you mention (if its on this thread I haven't viewed it as I'm at work). That being the case though, the guy is clearly a weapons grade fvckwit of the highest order. If it was my airline, I'd ban him from it permanently.
The fact that some passengers were saying "bye" and waving goodbye would suggest that he'd probably been being an irritant in some way - I doubt that would've been the reaction if they'd been genuinely spooked by him.
Course they COULD be out-and-out racists. But I think on balance, its...