I think some dogs are afraid of types of people. I was a dog foster mom for about a decade, we got dogs who were poorly socialized or just generally sheltered socially so they might be wary of people with darker skin upon meeting I never had a dog who I felt was “racist” like hated POC just like “oh this human is unusual” at first but I DEFINITELY had dogs who HATED men, they were placed at my house because no men lived in my home. One of my current dogs doesn’t really like women, he will choose men over women every time even if it’s a strange man versus me, his mom lol it feels a bit rude but he came from a home where his mom was really mean, granted he doesn’t hate women he strongly prefers men.

I think it just goes back to the same domestic violence stats we all know, those dogs hate men because men are more likely to beat the dog or be violent towards people the dog loves and the dog develops a fear. I’m sure there are some dogs who hate women in the same way it just seems a lot less common in my experience.