I doubt this will satisfy those who were complaining and there is a good chance that this will make some of them very, very angry with me. That being said…
I have played in a number of games at conventions set in the 1920’s, either CoC or various pulp systems. If I had thought about it, I would have assumed that many of the NPC’s were prejudiced against black people and can’t remember any where there was a black player character included. If I had been invited to make player characters for that game and had been told Don’t make any black characters, they would have to deal with prejudice I would have found that offputting.
I failed to realize was that by asking people to make player characters that kowtowed to Anna’s prejudice, I was asking them to go along with that prejudice and that was going to make them unhappy. I can't help feeling that is what is driving the comments, rather than a concern for possible player reaction.