That list of reasons was recently expanded to include "sexual orientation", but it was not expanded to include people currently engaged in sexual intercourse.
It's like hiring. You never, ever explain why you are refusing business or refusing to hire someone. It's sad that we must be silent instead of telling the truth, but given the number of thugs who are abusing the power of government, we cannot be honest in the presence of evil. We simply listen and at a convenient point, distant in time from the disqualifying information, we cancel due to an unforeseen conflict. But, yes, if appropriate I would refuse service for exactly that reason (just without articulating the reason).
I’ve had people whose business I did not want. Like one who worked for Planned Parenthood. I just never got back to her with a price quote. A person can also be given a price that’s way out of line or be told there’s a scheduling conflict.
WE RESERVE THE RIGHT TO REFUSE SERVICE TO UGLY PEOPLE!
Beauty is after all in the eye of the beholder.