I don't even know why those are stereotypes for us. Most people love chicken, kool-aid and watermelon. I'd say if you are gonna marginalize people for not likin those three, do it off the strength of the deliciousness of those food items. Not because of the color of your skin. Shame on you OP for being a HUMAN BEING who doesn't like watermelon.
That's so uncalled for, on top of being incredibly rude. I don't like watermelon either, but that doesn't warrant calling me a bitch. I'm sorry, OP. Try to take the high road, and move on... Holding a grudge will only let your anger fester.