I think people ignore the trauma Harry went through literally only a couple months before, when they downplay what happened to him in the Goblet of Fire, dubbing it “teen angst” in Order of the Phoenix. He was 14 when he was kidnapped, tortured until he wished for death, forced to watch a friend die, and was faced with the man who’d haunted his nightmares since he was 11. Then when he narrowly escapes, he is greeted with a teacher he respected and liked, trying to kill him and who was responsible for Harry’s near death.
Snape: You’re just like your father. Lazy, arrogant… Harry: Don’t say a word against my father. Snape: Weak. Harry: I’m not weak. Snape: Then prove it! Control your emotions! Discipline your mind! Legilimens!
Alan Rickman as Severus Snape in “Harry Potter and the Order of the Phoenix”