In my experience vegetarians get more hassle from meat eaters than the other way around. For one, they are often asked outright why they are veggies, which is actually quite an awkward question when you consider that a large portion of them do it for moral reasons and it forces them to adopt an air of moral superiority that infuriates non-veggies so much (unless they lie about it of course). For another, it seems to have become acceptable for people who do like their meat to bang on about it in a "humorous" fashion, which does make a mockery of one's personal choice when they uphold it for very serious reasons.
There are definitely obnoxious individuals on both sides of the fence, but disregarding the common 13-year-old girl vegetarian (sorry, I was one of these!), I'd say the majority of veggies are very modest about it (on a day-to-day basis, excluding forums for open discussion of course

).
Back on topic, meat does taste very nice and its wide availability makes it very easy to push animal welfare out of one's mind. We live in a society that generally deems the comsumption of meat as socially acceptable, so following laws of social psychology it's a simple dietary option to go along with.