MATUUU BO2 read the post above yours and the posts from Wolfex... they can ban you for just saying "hi", they can ban you for whatever they want... it is THEIR server.
Plutonium does not control the servers or micromanage how others run them. If a server is a crappy server and bans you because they think it is funny, they can do that.
You just need to find another server to play on.