Learn what "that's just not acceptable" means, when people say it, and how to use it naturally in English.

It means the speaker strongly disagrees and says the behavior or situation is not okay.
From My Handsome Bodyguard, Episode 5
A speaker firmly says that a situation or behavior is not okay.
Use this to reject something firmly in a meeting, argument, or complaint. It can sound cold or strong, so it may be too harsh for casual friendly talk.
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