Yes, exactly. And why reward someone who is rude with being nice to them? There is no prerequisite that says you must be nice at all costs. So, avoid avoid avoid. I would even go so far as to not make eye contact with this person, if you pass by them. Literally, I would ignore them completely. And if you must interact, keep it brief, professional and polite, but no need to be overly nice and extend any niceties towards them.

And I know what you mean. I keep re-learning the same lesson over and over again and I keep expecting people to be decent.