Well in the case of blood donation it’s more about not taking/giving blood thzt might have ISTs.
The questions you listes are “interesting” but i think something closer to the issue here (i.e filtering out people out of bigottry) would be like “in the last 4 months have you had sex with someone of the dame sex ?”
This just in folks: you can’t give blood if you had sex with higher class older women.