Years ago I consulted for a French company and analyzed their processes. Heavily depended on Excel. They all pronounced Excel Sheet as "Excel Shit". All day long it was sentences like"...and then I make an Excel Shit here", "... then I give the Shit to my colleague". It was glorious... (and technically they were right).
I'm bilingual too, and sure everyone with some training can make the distinction, but most people aren't super familiar with that kind of nuance in french and will make the mistake without realizing.
Then of course there are those that use a blatantly french accent without even trying a bit, which is mildly infuriating.