Roy Keane appeared to kick off at a supporter outside Old Trafford on Saturday.
The game ended 2-0 to the away side, with Eric Bailly (own-goal) and Bernardo Silva on the scoresheet.
After the defeat, Keane appeared to get into a heated confrontation with a supporter outside the ground.
Keane was signing an autograph for a United fan when he got into a verbal battle with another individual.
It's not clear why Keane was so riled up, and everything both himself and the supporter says isn't exactly audible, but it's obvious he wasn't happy at all.
"What did I do?" He can be heard telling the fan. "You've had a few drinks, they got beat, and now you take it out on me.
"You've had a few drinks. You can tell. What have you had? Two pints?"
The two individuals then appear to swear at each other before Keane storms away.
Keane was particularly animated during and after the game on Sky Sports.
He was flabbergasted by his former side's display in the first half, saying after watching the second goal back: "Look at Shaw and De Gea. What chance have you got in this game? I've been cross with these fellas for years.
"I give up on these players. These are international defenders. I can't understand the defending. I give up."
He then continued his verbal assault on Ole Gunnar Solskjaer's side after the game.
"It felt worse [than the defeat to Liverpool]," said Keane.
"It was so poor. The difference in class, quality and decision making, basically everything. I know the old saying is men vs boys, but United are so off it, it's unbelievable."News Now - Sport News