I'd be more inclined to go vegan if the current vegans weren't so aggressive towards non-vegans.
I've seen posts on Facebook with vegans bullying non-vegans about the fact they have cow's milk in their diet, which is an extremely common ingredient in many foods. I get there are moral arguments against cow's milk, but vilifying someone for having it in their diet? You're hardly going to convince someone to change their whole diet by calling them stupid, immoral, or any other ad hominem attack or we would have cured many of live's ills by now using this "method".
How far does it go? By building roads and houses, we are displacing animals, insects etc. that used to live there, isn't that a non-vegan thing to do and by living in a town/city you are a hypocrite?
Vegans need to understand that they are entitled to live the way they do and give advice to non-vegans on their diets but it is tiresome when thy shove it down your throats all the time and resort to namecalling if you disagree.