Teachers, by virtue of the fact that they spend so much time with students, are bound to leak out some of their leanings. I think that's fairly inevitable. And having my sister be a teacher for decades, I know from seeing her colleagues, that it's not uncommon at all. But flat telling a class what that teacher did should be a disciplinary hearing. It's no different from saying that Satan is the one true lord, that affirmative action is wrong, that social programs are wrong, that communism is the way. In that case, check your Jesian hoo-hah at the door.