We all stereotype people, knowingly or unknowingly. Based on some internal labelling system that we have. We label ourselves, and act according to our chosen labels as well. So I could identify as "poker player, ENTP, sociopath, weeb, capricorn, etc..." and those beliefs would affect the way I act. I could label someone else as "reliable, smart, book reader, narcissist, etc..." and it would be a good way to model my view of that person and my expectations of them!
So, give 3 labels that you best believe fit the person above you, all in good fun!