I feel the same way - it's juvenile. Here are a bunch of posts on this topic (I'm sure there are more.. I remember rounding up links on this several months ago)

How accurate is this "French military history"?

How true is the statement that France has won more wars than anybody else

Hey historians! As a French gal I often get told pretty bad jokes about how I should just surrender whenever a challenge comes up. I'd like to know if the jokes are justified and the French were indeed complete idiots, or just something blown out of proportions

Is the myth of France being bad at warfare credible?

When did the French military jokes start?

When did the "French Surrender" jokes start?

Any help with French surrender jokes?

France and World War 2

How capable was the French Army in WWII?