Sorry for very pathetic question, but I'm doubting myself and just want to know if I'm out of touch and potentially committing a faux pas here.
I have an older friend (60+) who is very likely on the spectrum and does some "off" things that doesn't really bother me as I'm used to her. One of them is when I buy us a coffee, she'll insist on getting 'her' loyalty stamp. (She will always say she'll get us coffee next time but rarely does). I thought this is just her being socially unaware, I would never dream of asking for 'perks' that someone else paid for. All fine. But recently I took someone else out for coffee, I ordered and she sat down, but then ran over to the till when I was getting the loyalty stamp and said "did you get both stamps?!" as if I was a complete CF. Please tell me if stamps are individual, or is the usual etiquette the one who pays gets the stamps?
I'm very aware in the grand scheme of things this isn't a big issue, but I've been robbed of so many stamps if the done thing is to 'split' the stamps I need to know!