Well, if the French and British Armies too the offensive while Poland was holding off the Germans, the war would have been over before it started. Germany's resources were pretty much used up by the time they "claimed" victory over Poland. All that the French had to do was go on the attack, which they didn't.
They weren't really designed for it. The French had very few strategic reserves to shift into positions to allow them to attack, and who would build the Maginot line and then just abandon it and go charging off into Germany? Colossal waste of money, that'd be. Not that it helped much.
It's usually the American's claiming the French, Polish and the other European nations that feel to Germany before 1941 as cowardly and surrender happy.
"The victors" would include the Americans, I should hope you know already.
And, while it is generally considered the Americans' fault for going "haha surrender monkeys!", that does not address the interesting (and ironic) situation regarding Dunkirk as spun by British propoganda. Had the French held on during their desperate post-government struggle I'm sure that they would've made the world hail their soldiers as heroes rather than cowards and called the British cowards for evacuating Dunkirk like "surrender monkeys", rather than the other way around.