Some of my family came out from the midwest to visit and see the ocean. I found out before they got here that two of my cousins were non-meateaters...one a vegan and one just a vegetarian. My

reflex kicked in and I thought "oh yeah, this is gonna be fun." Turned out to be a complete non-issue. I spent 5 days with 'em at the coast and we went out to eat 3 times, and the issue was never brought up. I was actually pretty impressed that they didn't try to crusade for animals, as they are both fairly young yet, and kinds are prone to get carried away with such things.
There's nothing wrong with being personally opposed to eating animals. However, once you start handing out flyers to kids that tell them their mommy is a vicious killer, you're just an bellybutton hole.