I can only speak to what I do. If someone pays for me I always thank them. If I happen to forget, it bothers me, and I try to remember to thank them the next time I see them.
When I'm the one treating I don't place any expectations on it, if thanks are given it's nice to hear. Far be it for me to force my manners on others. :D
But honestly I can't recall it ever being an issue. Basic manners in my view, and I've found that usually there's one person in the group who remembers to say thankyou, then the rest give their heads a shake and say it too.
But if not, whatever. Sign of the times maybe.
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