With respect, the HR department is there to protect the company, and not you. If you give them reason to believe that they need to protect the company against

With respect, the HR department is there to protect the company, and not you. If you give them reason to believe that they need to protect the company against you, then your remaining time there is likely to be short and fraught. And when you do leave, they will make sure you have no ground to stand on for complaints regarding diversity, etc.... If you can find or make friends there outside of this guy, you can potentially help them learn to lead by example, and thus he would become the outlier. But everything depends on you and your personality, and them and their personality. How willing and able are you to gently lead them down the right path? How willing are they to learn what the right path is, and follow you? At some point, you may have to decide whether it is worth your effort and pain to try to stay there, versus leaving and going somewhere else. So, I would encourage you to try and avoid burning any bridges if you can help it. But sometimes there is just nothing you can do to save the situation, and so you may need to extract yourself.