What do omnivores have against vegetarians/vegans?

I am not a vegetarian and I do not have anything against a vegan or vegetarian. Sometimes people like to talk or make fun of people that are different from them. I have come to the conclusion, that people like that suck. Ignore them and be happy with who you are. I wish we could all get along, but there are a few people that will ruin things for all of us.