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He didn't label you a racist, but I can understand why you would feel uncomfortable if you felt he did. Rather than lashing out and holding a grudge, maybe you could have responded along these lines:
'i don't believe I am a racist, and I'm mortified that anyone else would think i am one. Can you let me know why you thought that?'
You might have learned something. You have said elsewhere that you like to analyse and understand things.
You are a long way wide of the mark. I think some reflection on the fact that tenderloin is a long standing forum member with much goodwill from this community might be useful for you.