Gloater: (Noun) Someone who contemplates or dwells on one's own success or another's misfortune with smugness or malignant pleasure.

George Clooney defended his turn in the horrifically awful pile of horseshit Batman & Robin saying that he had no regrets because it supposedly helped his career.

He says, "I don't regret anything. With hindsight it's easy to look back at Batman and go, 'Woah! that was really s**t, and I was really bad in it'.

"The truth is, Batman is still the biggest break I ever had. It changed my career. I wouldn't be doing this now if it hadn't been for Batman." (Source)

Alicia Silverstone and Chris O'Donnell couldn't be reach for comment, however, because they were preoccupied holding their weekly burning of George Clooney in effigy.