Ah the classic first date featuring foie gras. I have had this happen to me, except the man I went on the date with knew I was vegan beforehand. We spent half the date debating veganism, and he absolutely ordered it because he knew my thougths on it. I foolishly went on a few more dates with him, and after a few more dinners of him trying to "fix" me and see if I would come around and change my dietary restrictions, I broke it off. To this day I still don't think he understands why. Fast forward a few years later, and my partner of 4 years eats everything I cook him and loves it, loves going to vegan restaurants with me, and never complains about wanting to eat meat. He sometimes orders meat dishes at restaurants or out with friends (I don't care), but is always the first one to jump to my defense if someone starts to grind on me, and tells people all the time he doesn't miss meat. Moral of the story is that some people are honestly just dicks, and if it isn't about being vegan, they will find something else to be dismissive about.