So, ‘humans are weird in space’ is a favorite of mine. We’re weird just on Earth - nothing else combines bipedal movement with not having a tail. Maybe it’s like that in space, too - and the aliens are freaked out by our balance. So when they find out that some humans make entire careers out of standing on one leg and kicking - which is just a nightmare for balance, unless you’re trained for it, I’m sure - the flip out. Similar reactions to ballet and tightrope walking. They straight up doubt the existence of hockey and figure skating.