This feels similar to if you are a vegan/vegetarian and the person asking to go to a steak house. Yeah you are fully within your rights to tell that person to fuck off and be done with it, but if it were me I’d just suggest a different place.

Most people are eating meat / using AI because it’s cheap, simple and normal and they don’t really know or think about the harms. If I bring up the harms on the date and they dismiss them then I’d probably move on, but if they seemed open to them, even if they ate meat that date, I may continue to date them and try and push them to be vegetarian.

I know many people who have become vegetarian because of their partner, if I can get my partner to eat less / no meat then that’s a good thing for the environment/animal wellbeing etc.