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?
Not in the way you're thinking of ("my human loves me!"), but they almost certainly understand it as a form of scent-marking ("we are tribe-family"), which is a pretty similar concept.
it seems to be on a level of intimacy to me that I find weird sharing with a pet.