"No black men" - What does this usually mean?

Curious what this means when a provider puts this on an ad or Site. I've read some reviews where a black man shows up to see a provider only to be kicked out (sometimes ripped off) by the provider's "boyfriend" or manager. I'm not black but wanted to know what this means for someone like me. Is it just a personal preference for some providers? Is there a scary guy hanging out in the bathroom or next door?

Just thought I'd ask.

It simply means that the lady chooses not to spend private time with a black guy.

I talked to a provider That posts no black men. She said younger black men cause trouble and try to pimp her. She does have some older black reg.

On my ad I say that as well but if they have verification and they are older respectful gentlemen then I will see them