Something in human nature just seems to force us to dig trenches that way.
Also, there are the moments when you as the vegetarian get lectured on how "it's natural" to eat meat when in my area, some 50-60 years ago, you would have been inredibly rich or lucky if you got one piece of meat each day. Go figure.
I do not think any hate is rational and believe that any kind of vegan propaganda is beneficial to the cause.
Fossil fuels are nothing compared to nitrite waste.
So, maybe it's possible to persuade people to stop eating meat, but it requires much wisdom and patience... I don't really try. When my friends ask me, I answer politely, but it's very hard, because when I say: "I'm do not want to kill living beings for food because they're suffering" it's already sounds like I'm blaming them. :(
How then can we possibly take the killing of life so lightly?
But I find is that vegetarian propaganda is many times so disgusting and based on lies that it's probably going to turn people away from vegeterian food. Some vegeterians and vegans are obnoxious bigots and their efforts are generating opposite result - people start hating vegeterians and vegeterian food.
So I don't evangelize vegeterian. Besides, my reasons are too complex for most people to understand: "But chicken and cows were created for us to eat! They are not suffering!".