If he is going to be an A-hole on the ground,,, im fine with throwing him off. Why would we expect him not to act worse at 30,000 feet? Screw him,,, have some common manners and you won’t get thrown off.
Yep, add in some booze and that’s an unpleasant flight.
Also, it’s worth noting he directed this at the attendant or crew. He wasn’t just chatting up the passenger next to him.