Why do people hate veganism so much?

So I go to high school in a pretty conservative town and literally everybody makes fun of me for being vegan. I have never try to push being vegan onto them or have criticized their diet choices. They are usually trying to "disprove" my veganness by taking about how insects are in all foods, and I just don't really understand why they feel the need to disprove me. I would get it if I was some overly obnoxious person trying to make everyone vegan and yelling at them, but I haven't, so I just don't really understand why they do this.