Socrates claimed that he was not, in fact, corrupting the youth. Given that a group of Athenians then found him guilty of that to the point where he felt obliged to kill himself it seems fairly likely that his peers suspected him of arguing in bad faith.

A bad-faith heretic! Double the crimes that I initially thought. Maybe we do need to keep his dangerous ilk out of universities, he would no doubt have been harshly judged on HN at the time if they'd had HN back in the good old days.

More seriously, the academics have perfectly fine standards - to be an academic you need to have studied something deeply and make logical arguments. To speak on campus you need to be sponsored by an academic. That really is all that is needed and they're reasonably objective bars to meet. None of this "oh no he's got bad faith!" stuff that is trotted out for politics. Argue about the outcomes of policies, not the unobservable mental state of the people putting the policies.