He got banned for being unprofessional. You dont just assume it is ok to put a person's real life information on a forum, even if it wasn't the right information.
He had his reasons why he did what he did and it WASNT ok.
Outing of any kind is never ok. Just like cyberbullying and stalking, slander and defamation of another's character is never ok. There is always going to be consequences...