Dana White tells TMZ Sports he's really sad about the arrest of UFC Hall of Famer Stephan Bonnar -- saying, "He's a great dude and it's unfortunate."
TMZ Sports broke the story ... Bonnar was subdued by concerned citizens in Nevada on Sunday after he was driving like a maniac 10 miles off the Vegas Strip.
When the Highway Patrol arrived, Bonnar was passed out in the front seat of his car -- and reeked of booze. He was booked on a felony DUI charge and the video of the arrest was very disturbing.
"I'm obviously sad about it because he's a guy that I care about," Dana said .