It depends. If the teacher has a pretty good record, probably not. If they're looking for an excuse to get rid of the teacher, maybe. Report it. It cant hurt.
Fired? Not typically unless it was really bad, but there are standards that need to be followed and a teacher can be penalized by suspension.
Depends if its hate speach against a certain group,if he uses racist,sexitst or homophobic termes then he can get into trouble.
it'll probably look good a little bit redder :)