A pizza is no more a pie than a boiled egg. Everyone knows this. A pie is something you have for desert that involves having a base and a top of pastry with some sort of blueberry, apple, or pecan based filling inside. A pizza may be served at either breakfast, lunch, or dinner, but never as a desert. The only type of pizza that you could perhaps refer to as a pie would be a Chicago style deep dish pizza, which has the same depth as a pie and has a crust that vaguely resembles pie crust. There is absolutely no excuse for referring to any type of conventional pizza as a pie.
People who refer to pizzas as pies are generally insufferable hipster-types who never stop looking for ways to make themselves feel superior. “You’re a Tim Horton’s drinking simpleton who scarfs down pizza while I am a sophisticated person who eats pizza pies.” Christ. If you want to make yourself feel superior than go find yourself an Ethiopian restaurant.
In normal times it wouldn’t really matter if some self-important hipster went around calling pizzas pies, but we are not living in normal times. Donald Trump was just elected partly as a reaction to the growing numbers of insufferable and obnoxious pseudo-sophisticates who were constantly rubbing their misplaced sense of superiority in people’s faces (that and the intervention of the Russians and a press release from the head of the FBI…). Every time someone refers to pizza as a pie another Trump voter is created.