Because he's some provincial jackass who thinks anything outside of his personal norm is an unjust and unfair imposition on his right to act as if his experiences are the only thing that dictate what reality is.

He's the same kind of circus clown that gets angry when you correct him on a factual matter, or on grammar, or if you criticize a popular movie he likes.

He and people like him are extremely self-centered, arrogant, know-it-all crybullies who think they are smart because they are adults. They are clearly not.