A brutal video of a McDonald’s worker beating up a female customer who apparently “disrespected” her mom surfaced on Thursday.

The video begins with the visitor throwing a milkshake at the employee who is angrily marching toward her.

The worker grabs the woman, who is wearing just a small black tank top and gray shorts, and starts pounding her head on a table.

The worker throws the customer around so brutally that one of her breasts falls out of her top.

The larger woman then pummels the milkshake thrower with wild, swinging blows before tossing her onto a cushioned seat.

At this point, other employees try to get between the two women as the very one-sided fight rages on.

Another employee, wearing a blue shirt, eventually restrains the battered patron but gets an elbow in the face for her effort.

The first worker tells her: “My momma ain’t dead, you respect my momma.”

In a last-ditch effort, the customer picks up a chair, but the waitress disarms her with ease.

The video was uploaded to Instagram by another customer who wrote: “So this happened at McDonald’s.”

“The lady asked for a water cup and supervisor shut down the soda machine because she wasn’t letting her get a free soda.”

It is unclear which McDonald’s branch the fight took place in, but at least one report suggested Las Vegas.