I think what the tennager did was a consider a good decision. Just sit cool, pretend to listen and give 1 word reply.

This kind of people are usually assholes as they all Lan Ci type, you think he really hate him no.. He just wanna create a scene so to show the people on the Bus he is some big boss.

Agrueing this people is rather endless and sucumb to violence will only give him excuse to bring you down so no point wasting your breath/strength on this people.

I think he shouldnt reply at all eitier just ignore him, or if he to noisy then find another seat and if no more seat then just stand.

Isnt it a little self centered talk

Let say you r in a bus and 1 bagero talking loudly on the phone you dont find it annoying?