[semimojo]

If they ask questions they have no right to ask, then I will not feel obligated to answer truthfully.

If you come onto my property and request a service I have the right to ask you pretty much anything I like.

You have the right to refuse to answer but that refusal may have consequences.

[DesertRhino]

Yeah, and you get to go broke when we shop elsewhere. You do you, boo.

[SauronOfMordor]

If you come onto my property and request a service I have the right to ask you pretty much anything I like.

Have a questionnaire asking for "real biological sex" or "have you ever had an abortion?" (not in the context of a medical visit) and get back to us about how that goes.