Le Dînner De Cons

I've just finished watching "Le Dînner De Cons".

THE WORST MOVIE I'VE EVER SEEN, MY GOD!

I'm trying to understand why the French may find this movie amusing. Can it be because of their personality preference for perceiving over judging? Do they want to watch the "evil" suffer in a slowly disturbing way?

This movie definitely is going to go on my "the most detestable movies list" right next to 'Gummo'.