Seriously, Why did I get banned for writing a "bad" joke?

Noone told me to not write things like that.
Couln't u just warn me to not do it again?
please let me play on this server. This server is the reason why I play world of warcraft. I beg you please, Let me play!
Now I know what i did wrong so it wont be repeadet.

My char name is ohdear ( witch u blocked and then i wrote a topic and u banned the account....)