You don't seem to be understanding that it is clearly not about one clerk. It's about the local consensus results in that clerk feeling entitled to dismiss the GPs wife and family as non-persons, as being lesser than someone born in the USA. This is something they will feel every day at every level if they live there.

Having your family members feel dehumanized in every interaction in their daily routines is not worth any amount of money if you care at all about your family when you can instead love somewhere where basic respect is the born.