Ah, I don't check out Asian SPs, so no wonder I've never seen it. One thing's for sure, I've never seen a "No White guys" warning.Actually this happens from time to time, Asian SPs will not see Asian clients for the reason of staying more anon among her culture. Sometimes they get more specific in that they will not see Chinese, Korean or whatever nationality they are, but they will see Asians outside their nationality.
I have a few SP tell me that they do not see Black or Indian clients due to bad experiences in the past. Sometimes bad financially, sometimes bad physically, sometimes both.
Perhaps it is time for a new movement ..... BDM? Black Dicks Matter
As for SPs saying "No this guy" and "no that guy", I am 100% confident it has more to do with with other factors than the reason "I don't want to bump into someone my their community".
But no SPs have the guts to say it on this board.