Don Frye Punches Fan At UFC 270 After Argument

UFC legend Don Frye got into a physical altercation with a fan at UFC 270, punching the man in the face … this after the retired MMA star and pro wrestler tells us the guy bumped into him and challenged him to a fight.

TMZ Sports obtained video taken at the Honda Center in Anaheim, CA Saturday night … showing 56-year-old Frye jawing with two men as someone who appears to be security attempts to keep the peace.

Frye is seen popping the guy in the head with a jab (clearly not at full force) … sending the man’s head snapping back.

We talked to Don … who tells us the incident started when the guy, who he believes was drunk, bumped into his hat. The men then had a spirited conversation, which Frye says culminated with the man challenging him to a fight.

You can only assume the man didn’t know he was challenging Frye … one of the UFC’s earlier stars, and most powerful strikers.

Frye won UFC 8 and Ultimate Ultimate ’96 tourneys … and was the runner-up at UFC 10. Over his incredible career, Don beat guys like Ken Shamrock, Tank Abbott and Mark Hall.

Frye — who recently went on Joe Rogan‘s podcast and explained how he got into MMA — was inducted into the UFC Hall of Fame in 2016.

In addition to the UFC, Don fought in Pride and K-1. He also boxed and kickboxed professionally, and was one of Japan’s biggest wrestlers during his time with New Japan Pro-Wrestling.

Don was not arrested — and stayed to watch the remaining fights — including heavyweight champ Francis Ngannou defending his title.