A lot of people kiss their pets or non-human animals in general. I find that very weird. I understand that it is a sign of affection but it seems so off. One reason is that I doubt whether animals really understand this. Also it seems to be on a level of intimacy to me that I find weird sharing with a pet. Not necessarily romantically or sexually (that would be even more weird and wrong and probably illegal). But it is still "more". I am not sure whether I can really explain why exactly I find that weird.
Anyway, what is something that is weird to you but not to most other people?
On the other end of the spectrum, walking barefoot, but especially outside (I recognize I'm likely the weird one with separate indoor and outdoor slippers)
Seemingly insult their closest friends and family in specific and personal ways
Feel comfortable drinking more than a drink or two in public (and/or other intoxicating drugs like cannabis)
That's all that comes to mind at the moment, but I know I've felt that way about many other behaviors. I'll try to remember to add any others that come to mind in an edit below.