Why do people have so negative opinions about Vegetarianism/Veganism?

Anonymous
My gf is a vegan, which means i dont eat that much meat at home. It's not a problem for me, because my gf is really good at cooking and i can put together a good meal that is vegan.

But i dont understand why some people are so harsh and mean to vegans making jokes and talking about them eating meat and stuff like that. Being a vegan is their choice and it should be respected as their way of living.

And not only are they against killing animals, but it's good for the enviorment aswell since the meat industry is a huge factor to global warming.

Anyways, i want to hear your thoughts :)
Why do people have so negative opinions about Vegetarianism/Veganism?
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