I was once in a women’s clothing store in Boro Park, when a man called and asked if he could come buy clothes for his wife. The Chassidish woman who owned the store said no, she doesn’t allow men in the store as the women will walk out.
About 2 weeks after that, I was in a specialty non-Jewish women’s clothing store that actually had a sign, “No men allowed past the cash register”, which was right at the front of the store.
I told them I like that rule, and they said that they made that rule because they noticed that women wouldn’t buy as many clothes if there was a man around.
I think people should be allowed to make rules about who they want to serve. It’s their business they’d be losing.