Temper, temper Asston Kutcher.

Drunks shouldn't be antagonized!

On Monday, Ashton and his grandmother wife, Demi Moore, attended the after-party to Ashton's gig at the ?24 Hour Plays." in NYC. The duo caught up with pal Jennifer Aniston and were trying to enjoy the evening.

That is, until another party guest decided to get his mockery on.

His target: Demi!

An eyewitness at the party recalls:

?Demi and Jennifer Aniston were happily sitting together in the VIP when this guy starting really obviously making fun of Demi and things like her relationship with a younger man. It went on for quite a while. Ashton heard it and approached him. At first he thought the guy wasn?t serious and was like ?what the?? He then realized he was serious. Ashton lost it…It got pretty heated, nobody knew what to do."

As Ashton lost his cool and went into a rage, Demi was said to look very embarrassed. Once the verbal spat finally cooled down, the couple and Aniston escaped through the back entrance.

Wow! Wonder what this guy could have said to get little Ashton do riled up! We think maybe he's just a tad too sensitive? Afterall, who hasn't made fun of Demi Moore?!

Granted, very few people are ballsy enough to do it in earshot range, but we commend him for that!

Learn to relax, Ashton!

[Image via WENN.]