The last straw
THE LAST STRAW → The final unpleasant event in a series that causes one to finally lose patience. ?
Ex.: She is always making fun of me, but it was THE LAST STRAW when she started calling my mother names.
BONUS:
1) call somebody names → call someone by insulting names.
2) make fun of someone → to be unkind to someone and laugh at them.
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