Can you get banned on WikiAnswers?

Yes, you can get suspended from WikiAnswers. Usually people get suspended for chatting or ignoring supervisors' warnings of various infractions. The length of suspension can range from a half-hour or permanently. The length of suspension is up to the supervisor. Spamming, blanking, obscene posts, cyberbullying other users, and nonsense answers can all lead to a person being suspended.

You most likely won't get suspended permanently, however. Supervisors usually give out temporary blocks first, assuming the offenses are not major. Cyberbullying is a major offense, and you will not return from that.