So in conclusion Don't force your beliefs on me especially not when I am eating. I would never do the same.
What exactly do you mean by "don't force your beliefs on me"? Because to me it kind of sounds like "don't advocate veganism," or "stop putting uncomfortable thoughts in my mind!" Unless someone is invading your private space or putting a gun to your head or somehow coercing you, they're not forcing beliefs on you, they're just starting or continuing a dialogue.
There's a lot of cognitive dissonance going on with meat eaters who also identify as liberal. They like to pretend to themselves that they care about the environment and using resources smartly and animal rights and things, but if actions speak louder than words then in reality they don't give a fuck and they just like the illusion of having moral high ground. When it's pointed out that they don't practice what they preach they feel uncomfortable -- that's the dissonance or sense of hypocrisy. The only permanent way to resolve that feeling is to modify your actions so that they align with your beliefs, or to accept that you don't really care as much about environmentalism/liberal ideals as much as you thought.
Vegans can and should be aggressive in their attempts to spread veganism, because they're right that it's a much more sustainable and ethical lifestyle. It should always be remembered that nobody is perfect though and we should always be ready to accept valid criticism from others on other topics. The fact that many vegans know they are right can (and sometimes does) promote a self-righteous or "holier than thou" attitude. People trying to convert others should try to avoid that style as it comes across rather badly. If everyone rushed very quickly in the shower each morning then a lot of water and electricity would be saved, how many of us do that though? If everyone remembered to unplug electronics when they're not using them, well a lot of electricity would be saved and so the environment would benefit, but how many of us do that? If we didn't spend so much time playing games or using electronics (etctera etcetera, hopefully the point is conveyed)