Sometimes it makes me unreasonably upset when people refer to a pizza as a "pie".
Why do you hate people that call pizzas pies?
Pizzas are not pies.
If people want to call pizzas pies, that's their decision. You shouldn't hate people for dumb reasons.
Well, pizzas are not a pie, I just wish that everyone knew that.
You're just getting way too upset over this, and if someone calls a pizza a pie then you should just let it go. You could also correct them, too, if you really wanted to. However hating them is too far.