It's frustrating. I kinda get it though - the French are proud of their language, and if they've got well-meaning travellers coming through and butchering it in new and inventive ways (particularly in high tourism areas) day in, day out... I can see how it would be grating.

I was in Starbucks on the outskirts of Paris, and ordered by drink in pigeon French, and the barista answered me in English. I answered her question in French, and she answered me in English. This went on for a couple more exchanges before we both laughed at how absurd it was - I asked "is my French really that bad?" and she just says "no your French is fine, but I can speak English better". Fair enough.

I have heard though that outside of Paris though, people are far more appreciative of someone learning the language, to the point of being brutal with it. A friend was out in the North of the country, the locals loved that he was learning, but then let him absolutely sink when he reached a stage of a conversation where he was struggling. They could quite easily have bailed him out in English, but in fairness they made him think that little bit faster to make him learn.

On the other hand, your German beers are much better than our French beers. Perhaps it was kind but clumsy advice?

Lovely city, terrible people, as they say.