What does it take for it to be socially acceptable for a woman to hit a man?

This is just a hypothetical, I do not want to get hit by women, I just wonder what it would take before most would deem it justified to react that way.

Anyway, what do you think, and preferably I'd like to hear the least bad example.. That doesn't sound like proper English: The least excusable offense that would warrant a physical reaction.
I should probably specify the degree of damage, how about regular palm slap on the cheek, something along those lines.
What does it take for it to be socially acceptable for a woman to hit a man?
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