This was the wrong decision. Liberal institutions in the west have begun to increasingly yield to the demands of extremist minority views and doing so only emboldens them. You are free to insult white people, Christianity, and non transexual heterosexual men in this country but everyone else is a protected class. Even speaking positively or respectfully discussing the protected classes in a vaguely defined wrong way…
Were you upset of the 'don't say gay bill'? It's an example, not just of a single school acting to restrict academic freedom and freedom of expression in general, but the actual government enforcing this on ALL schools. That should be enraging to anyone who cares about freedom. A elementary school teacher was fired not too long ago for reading 'A need a new butt', because Christians found it offensive.
I think the decision to fire this guy was wrong, but this sort of action is hardly the sole domain of the 'left', the 'right' is doing plenty of censorship in schools all by itself.