Lots of people care. I regularly go to a sports bar that features beers around the world. The guys in my group love to peruse the beer app that the bar sponsors. I order water and eat only the healthier items on the menu.

Despite their love of beer, I think that my health consciousness weighs on them... makes them feel a little guilty. Consequently, they make little comments about my lack of drinking. Harmless stuff, but my guess is that they're actually expressing disappointment in themselves.

I especially notice that when new people are with the group, the core members feel that they have to point out and explain that I only order water. So there's obviously some tension and discomfort there.