I sometimes go to thrift stores when visiting new places just to see what is there and my experience is different. Goodwill/thrift stores in richer cities/areas are better. I went to a goodwill in Atlanta in a poorer area in May and the clothes we pretty worn. The prices were cheaper but you can't fake being middle class in most of the stuff sold there. You will just look poor and that's how many would treat you.

Then you haven't been to an actually poor one. Every single one I've been to looks like that one room in an old person's house, full of stuff that no one could absolutely give a shit about and priced WAY the fuck over what it should be.