You call your teacher ignorant for not believing you. But you make a claim for which you have no evidence and no argument. You can't produce any yourself, even after the fact. And so you come to others seeking support for your position, including the sources you'd have needed in order to be able to justify having it in the first place.

Your teacher isn't ignorant for not believing you. She's right to not believe you based on your unsupported assertion. It may turn out in the end that you're right about Kant being racist-- I don't know about Kant's stance on race--, but you've got to go about this the right way. You have to have support.

Any interest in proof of Kant's sexism? Or was your professor at least willing to accept that one?