Stay within yourself, discipline
If opponent plays stupidly doesn't mean you have to follow their stupidity. Pick your spots, if you have them vastly out-chipped, if you have a superior hand, and can stand the loss, call occasionally, just to see opponent's reaction if they lose when they are called.
If you play the game to win, the bully call-anything, most of the time you either min call or fold to their bullying. A lot of them don't care about the game, they want a reaction: anger or frustration, often both. You can get them angry and frustrated by only playing the hands where you are a clear favorite and winning.