Oliver Tree beat the snot out of a fan who climbed on stage and got far too close for comfort ... and it's all on video!!!
The singer was performing at the Forgotten Runes NFT convention in New York City when a fan made it onto the stage and tried to put their hat on Oliver's head ... then got their butt kicked.
Oliver body slams the fan to the ground and starts throwing punches. Following a pretty good beat down, security drags the fan off stage as Oliver tells the crowd, "Get this f****** prick outta here!!!"
Apparently, the police were not called and the fan offered a piece of advice as he was being escorted out of the event, ... "Don't go on stage or you will get beat up by Oliver Tree."