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Misuse of Berserk Button. Some other trope from Anger Tropes might apply though.
Berserk Button is about something relatively insignificant, like chewing gum or incorrect pronunciation, that sets one off and they are absolutely furious.
Getting angry over personal insults about one's nationality/religioun or people responsible for death/arresting of his friends is not this trope.
Wrong Example Indentaion.
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How well does it match the trope?