While I'm usually all for that sort of consequence to happen to someone who is legitimately being gross or creepy; I don't think they should've actually fired her. Legitimately it should've been a stern warning and a request to apologize for the statement at worst.

Do I think it was a good idea to tweet it? Of course not. Was it unprofessional? Probably. I guess it depends on if the tweet or statement was made IRL or on Twitter via an alternate account.