Beyond the Gender Binary, Problem Solved

(In the computer shop) Dad: So... The shop assistant that served you earlier... Was it a he, she, or an it? Me: It was a he. Dad: Sure? Me: Yes, dad. (Later, after the assistant has come back, served us and left again) Dad: You were wrong. Me: Huh? Dad: It wasn't a he, a she or an it. It was a ginger.