It will be interesting to see how this plays out. Too early to know all the details.
Regardless of your political leanings, talk like that is inappropriate. The reports says that she is a human sexuality teacher. If she was holding a class in human sexuality, I wonder how her rant played into the lesson plan.
The union's job is to come to her aid. Since the student has an attorney, I expect that discussions will happen in private with the college. If what the reporter says is true, it is unlikely that the college will defend this prof. Too much for them to lose financially.