Ok but imaginary friends (ways humans are weird)
Humans pack bond. We just do. Aliens learn quickly that spending any significant amount of time not being actively antagonistic to a human, they will bond with you.
They bond with other humans. While humans do not necessarily bond with everyone it’s pretty easy to become low-key with others for most people. More serious bonds take more time.
Humans bond with animals capable of bonding with the human. They bring both predator and prey (hopefully not together) into their homes and make them part of the family.
Humans do the same with animals that can’t bond because their brains aren’t wired for it. We don’t care. We love them anyway.
Humans bond with inanimate objects. It’s actively encourage for child to build social skills by practicing on toys. Adults even do it
They name cars, computers, phones, and other things.
All these can be explained and understood relatively easily.
But imaginary friends…the aliens don’t get it. Humans pack bond with things that DO NOT EXIST
they have bonds sometimes closer than those to any of their peer group. Child play with these nonexistent things actively and we don’t find it weird. Adults put out extra place settings at the table for their childrens imaginary friends. They chose a different seat if a child tells them that a clearly empty chair is their imaginary friend’s chair.