Is it ok to call people poopy-heads, but in a mature and intelligent manner?
Signs and portents ...
I don't recommend it, but I'll have to see individual cases to know whether I'd bring down the banhammer.
As a general thing, I don't recommend using insults which might stabilize bad behavior by making it part of a person's identity. Also, I have a gut level belief that people are less likely to think clearly when they're angry.
Viliam Bur made the announcement in Main, but not everyone checks main, so I'm repeating it here.