Learn what "must you act like such immature preschool children" means, when people say it, and how to use it naturally in English.

The speaker is complaining that the other people are acting immaturely.
From I Think My Wife Wants To Kill Me, Episode 20
The speaker criticizes others for behaving in a childish way.
Use this to scold someone for childish behavior. It sounds insulting and is not suitable for polite conversation.
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