Profanity would be an example, so long as you are not cursing the other person.

Pointing out a stupid belief that is easily dispoven with basic common sense as stupid.

Acerbic sarcasm.

Macbre humor.

Expressions and sayings that are cultural.

If you're asking someone to shut down aspects of their personality and whintheybare just to "debate you" or have a conversation, them you're not really interested in their perspective. You're interested in perfoeming civility. As some point this is about elitism.

It's a fine line, I grant you.