it's because French is the lingua franca of esoteric angloid douchebaggery.

Ah ouais. Le Tar-zjay, Le Kro-zjay... c'est magnifique, c'est incroyable. Allons-y, si vous plait.

my fave is to pronounce Publix as PUBE-licks. that's a crowd pleaser and if you say it front of a parent with their child, it has cascading effects.