I avoid that by not assuming to begin with! If I see a character, I wait for the player to describe and introduce them. From that, I have my character respond accordingly.
So someone wearing an acolyte robe and holding a book can be described as a warrior and I'd be okay with it, because I'm looking more at what is written than anything else.
So someone wearing an acolyte robe and holding a book can be described as a warrior and I'd be okay with it, because I'm looking more at what is written than anything else.