What's most important are your grades. As long as your grades are what you think they should be, let it go. Be as assertive as you need to be to understand the material. Either way, save the nasty email where she says you must have emotional problems. You may want to use that later if you are unfairly graded. Otherwise, I wouldn't fight, just be confident and assertive. Let this teach you how to deal with future A hole, bullies and make you stronger.