Fantasy humans are freaks
So, set aside all the speculation about what kind of scary aliens humans would be from the perspective of other species. Let’s talk fantasy for a second.
Everyone knows half elves, and we know the other half is human but we don’t call them half humans. Why? Because it’s assumed all half breeds are part human, since humans will fuck anything.
See it’s not just elves. In D&D, for example, there are half orcs, half angels, half demons, half elementals, half spirit-things, half snakes… humans are out there fucking whatever pops a tentacle through to the material plane.
And of course I’m not saying this is never consentual so the other races must have people that are dtf with humans but I don’t think they’re known for it. I think humans are the ones that initiate pretty much every time.
So I feel like in fantasy when someone is like “oh I’m the cursed offspring of a magic cow and a -” everyone will just cut them off and be like “ – human, yeah, fucking a magic cow sounds about right for those horny bastards.”