How would you ever know? Medical records are supposed to be private. My experience has been that the un-vaccinated tend not to need doctor care as often as those that are vaccinated (from conversations with parents). I would think that you would have more contact with un-vaccinated folks at schools, stores, sporting events, church, etc...would you take you business elsewhere?
I don’t know what I don’t know...can’t make decisions on what I don’t know...no point in worrying.
Hypothetically, I might know by the doctor’s stated policy.
I sure can’t do much about the herd, so I don’t worry about that, either.
Live and let live, as much as possible.
Especially the unvaccinated dead ones.