T.I. Shootout Ruins H.S. Gig He's Too Gangsta!

5/27/2016 12:50 AM PDT

T.I.: NYC Shooting Ruins Graduation Gig ... He's Too Gangsta!

EXCLUSIVE

T.I.'s wallet got caught in the crossfire of that NYC shooting -- a huge high school graduation party thinks he's damaged goods after the violent incident ... and organizers are demanding a $55k refund. 

Tip was set to perform a concert in South Florida for grads from multiple high schools on June 11. The contract was signed and promoters had sent him $55,000 to retain his services -- but then the shootout happened.

TMZ has learned promoters fired off a legal notice saying, due to the shooting, "the quality of the Talents services is not satisfactory to our Client." They added ... the event was marketed "as a safe environment for the students."

Translation: We're worried kids will get shot if you do this show.

To be fair -- T.I. and his crew had nothing to do with the NYC incident. He hadn't even taken the stage when the shots rang out.

We've reached out to T.I. ... no word yet on how he plans to respond.