I have been to some restaurants who’ve sort of tried to serve me a vegetarian meal. It’s not that they won’t serve vegetarians, it’s that they wouldn’t try too hard and were not used to such requests. But, the restaurants at which I’ve eaten, that have served meat, have not had such a disclaimer as the one you’ve presented here.
So, I just wanted to mention that it’s with reluctance, but even though grudgingly accommodated, restaurants that serve the typical meat offerings do at least serve something to vegetarians, upon request.
I think that vegetarianism is in fact getting more acceptable in France; but as with everything there are pockets of acceptance and pockets of resistance. That exemplifies the nature of change.
It’s good to go and to go through the bother of mentioning that one is vegetarian, if only to increase the numbers of clients/eaters out in the world of a cultural meat-eating society.
Bravo for not eating at that restaurant. I think it’s a bit unusual to find such overt opposition. At any rate, good luck and most likely you’ll find a salad or something to munch, at other less-vociferously anti-veg restaurants en route.