I still pull over and allow someone to pass and I still wave if someone allows me the same courtesy. Tinted windows sometimes don’t allow others to see your thanks so I don’t have a problem with hitting the blinkers as a way of saying thanks.
Yeah you are right about the tinted windows it just aggrevates me a bit We Texans take thanks personally.
My wife a Kansan never understood the whole wave thing until we were in Texas for a while then she started to get it.