The comedian skewered Hart during a portion of his stand-up set at The Wilbur Theatre in Boston Friday night, calling him a "midget with a regular ni**a's head" and a "punk bitch" ... among other insults.
Blackson also rips Kevin for essentially snitching on himself during his whole sex tape/extortion scandal.
Here's the backstory -- Blackson and Hart used to be friends, but Kevin took issue with Michael using his cheating fiasco as fodder for his comedy ... so he called him out during a 'Breakfast Club' interview by referring to Mike as "the Instagram model that just shows her ass and is looking for love."
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Blackson took issue with that and vowed to keep blasting Hart, saying ... "when I'm done with you u will commit suicide by jumping off the curb you short f*ck."
Damn. It's on.