I don't eat red meat. It's not a political choice (not heavily, anyway) as much as I just decided to cut it out of my diet almost five years ago.
This means that I have to look out for what's on the menu at restaurants. And unfortunately, when people have me over for dinner, they probably don't know ahead of time, creating awkward situations for everyone. I don't want to be a picky douchebag, and I don't want them to feel like the need to make special accommodations.
I know that in moderation beef isn't bad, but when I stopped and looked at where the cholesterol came from in my diet, it was almost entirely beef. So I stopped eating it. Poultry and the occasional soy-substitute product generally meet my protein needs. Later, I also learned more about how inefficient beef production is, and the environmental impact. I don't care that people eat cows and swine, because we are omnivores and top the food chain. I think our culture eats way too much of it though.