O.J. Simpson has belatedly fired back at the Cosmopolitan in Vegas ... suing the hotel claiming it defamed him by banning him in 2017 after falsely accusing him of being drunk and disruptive.
The incident in question went down just weeks after Simpson was released from prison. Simpson -- who had been frequenting the hotel in the days prior -- allegedly got into an altercation on Nov. 8 at Clique Bar after flying into a drunken rage.
Sources told us ... glasses were broken during the melee and the ex-NFL star was eventually told to leave, given a trespass notice and told to never come back.
But, in his lawsuit, Simpson is adamant he was NOT drunk, he was NOT belligerent and did NOT break any glasses. In fact, he says earlier in the evening a manager at the steakhouse in the hotel actually thanked him for being a gracious guest.