ODD FUTURE GETTING SUED FOR SAN ANTONIO BEATDOWN!

Several members of the rap group Odd Future unleashed an unholy beatdown on a fan who dared to jump on stage during a show -- a fight captured on video -- and now, the fan is gearing up to sue.

17-year-old Chassan Rasagi filed a police report with the San Antonio PD, claiming they beat the ever-lovin' hell out of him.

Sources tell TMZ ... OF rapper Hodgy Beats pushed Rasagi back into the crowd ...and he then became a human ping pong ball when the crowd pushed Rasagi back on stage. At that point, we're told the group attacked Rasagi en masse.

Rasagi suffered lacerations on his head, scratches, and burns to his body during the melee. He also suffered two seizures. Rasagi now plans to sue the group. It's worth noting some people in the crowd claim Rasagi threw the first punch.

Now that's what real fans do

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