It happens to a lot of people for a lot of reasons. I tend to tell people that I hate them for who they are not their race.
Side story... In college I used to work at a Liquor Store in a big city. I had regular customers of all races, social standing, etc. I once asked for ids from a black couple. Well they got all mad and started calling me a rascist, etc, etc.
Several very large rough looking black regulars were waiting in line while this was going. They "politely" told the irate customers that they needed to back off and that they had no right to talk to me that way. Pretty cool situation. I jokingly asked the regulars if I could get a recording of what they said for future use.
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