My neighbor is a full-fledged red-hat, and chose to tell me "You Democrats are destroying the country" after I said "Good morning" to him while walking my kid to school. Emphasis: he chose to engage while my kid was with me.
I said "We can disagree without being assholes. Or, at least, I can."
I will continue to say good morning to him, while knowing it is quite possible I will wind up elbow-hooking him.