Okay, so the whole humans are space orcs/earth is space Australia thing has me thinking: what about grooming/pampering?
Like, a lot of us go to spas/salons (or do the cheaper at home versions) to literally get hair ripped from our bodies using a large variety of different methods, to obtain our own personal desired levels of body hair. And we call it pampering. What if humans are the only ones who do that? Aliens that cut/dye hair, comb/style it in totally unique ways to suit themselves, but pull it out completely? What kind of creature tortures itself like that?
And we have so many ways of doing it. Tweezing, waxing, threading, hair removal creams that can burn your skin to name a few.
Plus there are facials that leave your face red and splotchy for hours afterward because they pick at your skin to remove gunk.
Massages, where in order to feel good they have to hurt you to remove the tension from your muscles, so while eventually it feels good, it hurts first.
We twist ourselves into weird positions to paint our toenails because our knees get in the way (not so painful, but reasonably uncomfortable).
We are willing to sit still for obscene amounts of time to get our hair/nails/make up done, even though humans are notoriously fidgety.
So some aliens at first would probably think we’re super vain (and some humans are), but more experienced aliens would be like:
“no, that’s just something the humans enjoy. It’s how they ‘treat themselves.’”
“But, Skrill, she’s literally ripping hair out of her face?”
“It’s how she gets her eyebrows - how did she put it? - ‘on fleek.’ Compliment them, humans are thrilled when you compliment them when they spend a lot of time on face hair removal.”