Nate Diaz is being sued by a man in Louisiana who says the MMA legend beat him up and injured him during a street fight in New Orleans last year, TMZ Sports has learned ... a lawsuit Diaz's people believe is literally laughable.
Rodney Petersen, an amateur fighter, filed the lawsuit earlier this week in Orleans Parish ... where he's seeking damages for injuries he claims he sustained during the April 2023 brawl.
"LOL" ... was the response from Zach Rosenfield, Nate's longtime rep, when we reached out for comment.