We tend to do that as a nation. Pro-choice people look down on pro-life people and vice versa, same with the gun control issue, same with religion. I have gotten to the point that I don't discuss my views with anyone but close friends because I'm tired of being insulted and generalized over them.
I'm not a meat-eater, but I can't stand the holier than thou attitude of the vegan across the way. He ripped me a new one one day when he saw me carrying a bag from a pharmacy because medication is tested on animals. My youngest daughter has hypothyroidism, without medication she doesn't get a hormone she needs to be a normal, healthy child. Untreated hypothyroidism leads to retardation. I tried to explain that to him, but it seems that lab animals long dead and that would have suffered whether or not my daughter was on medication were more important than her needs. Now, I don't like the idea that animals suffered to test medication, but I also do not want to subject my daughter to mental retardation. And on top of that is the whole aspect of if I don't provide proper medical care for my child the state could step in and take them away. I got so mad at him one day for harassing me about it for the umpteenth time that I asked him if he ate almonds, blueberries, or watermelon. When he said yes, I pointed out that nearly 100% of those crops are pollinated by managed honeybees, which right now are suffering from the stresses put on them by being used as pollination tools by the agricultural industry that they're dying off by the millions. I then added that we all do our best, but none of us is totally "pure" and maybe he should get off his high horse because I do what I can to help animals by not eating animals, wearing leather, or having down-filled items around the house.