I'm sorry this happened to you. Was the woman who shouted on you (the Moroccan one) is the same as the first woman who told you "you aren't the only one after him" in the elevator and who was staring at you when you asked someone else's help, or these were different women and the incidents weren't related? In any case, if I were you, probably I wouldn't quit, just to stand for myself. Maybe I would quit later if the job was not satisfying to me, but not because of someone else who didn't want me to be there. I understand you are different and not confrontational, I'm not neither, and I tend to be in the shadow, but if I feel someones is belittling me and show me no respect, then they have to confront me at all levels, starting with a polite and logical discussion. I haven't had any confrontation regarding work, because I've had only one position, and I largely work alone, but I don't care what anyone else's character is and if that how they are. We all don't like some people, but we must exert self-control, at least most of the time. I think you need to stand to yourself, as no one, neither your boss no the HR can stand on your behalf. These people are afraid of their reputation and they don't want to appear biased or (as probably in your case) racist. Good luck in your next job.