Quite frankly, the average bloke never really cared for the French and the Germans. Reminders of the Germans are still all around us - for example, I had to go to the London Bridge area today. Right outside the station is "The Battle of Britain Experience", in which you can, for a modest fee, go into an old Underground station and experience what it was like to have Dorniers dropping bombs on the city above you.
As for the French - they've been the butt of our jokes for a very long time. Everyone knows they're treacherous and unreliable.
Regards, Ivan