The brawl, which took place in full view of the paps, was apparently precipitated by an argument "about nothing."
"It was just dudes being dudes," an insider told TMZ.
With paparazzi cameras rolling, Guy can be seen kicking a crying Ariel Ramirez out of his SUV as the latter hurls epithets at the former.
The same insider told TMZ the gang had been enjoying alcoholic beverages on the flight into San Francisco International Airport.
"A bunch of guys were messing around," Guy's rep told the gossip site. "Things got a little out of hand, but they're all good now."
That'll teach Ramirez to play keepaway with Guy's sunglasses.