Its part of who are and to deny it is liberal hypocrisy

We will never get rid of prejudice (racism as well) because our minds use assumptions as shortcuts to organize our world quickly. Its in our best interest survival wise to asses possible threats as quickly as possible. If I were to meet you in on a deserted road in the middle of nowhere I would need to make very quick judgements on the potential threats you pose to me. So I compare you to past experiences and any prior knowledge you are similar too in order to quickly decide to fight flight or bond with you. Instead of asking you directly what your intentions are, I make shortcuts and choose to err on the side of safety. In today’s urban society were in a similar situation, there are so many of us that we dont have time to treat everybody as an individual and then decide whether to avoid or connect with you. If not our minds would be filled with minute details on every person we would meet, there wouldn't be time to go about our lives. So dont despair about prejudice, just be aware of prejudices for what they are and know that they are assumptions that could easily be wrong. Be open to anything.