As abrupt and sometimes mean WvI can be, he rarely if ever abuses his powers. Most likely you did something that violated the rules he set out for that particular board, so he banned you. Probably not a permaban. If you ask him politely, he'll probably tell you why he banned you, so you won't do it again. Don't argue or accuse, simply ask. If you have any problems with what he tells you, then you might have something that someone could look at. Until then, your next step is up to you.