Oh, brother. Lots of ignorant comments on this thread. Veganism is not a left-wing thing, stop trying to make it one. Granted, the overall percentage of vegans who are "liberal" is higher than conservatives, but that is changing. In fact, I've noticed there's a growing number of libertarian vegans, and I think that makes sense, when you think about the non-aggression principle, etc. The bottom line is, there's nothing inherently lefty about veganism...it's simply about choosing to NOT harm or exploit animals. It's about mercy / compassion. And please don't perpetuate the lie that "liberals" have a monopoly on compassion.
The Veganism we see via groups like PETA is a left wing thing. When you politicize and try to make a lifestyle out of your eating habits, and then try to force others to follow along, you rightly bring criticism and push back against you.
I don't have to hear about your soy based alternative to a hamburger, just eat the damn thing and leave me along with my real burger.
I understand where you're coming from, but I think you're misunderstanding veganism. It is not a diet. It's an ethical stance against the exploitation of animals, and it actually IS a way of living. A plant-based diet is part of it, but diet is only one aspect of veganism. It is clear from what you said that you think of meat-eating as strictly a personal choice. What you won't like to hear (but it's true) is that actual personal choices are victimless, they only affect the person making the choice. Eating meat and using animal products is not victimless, not only are sentient beings being enslaved, abused and brutally killed unnecessarily, but the environment is also affected, which ripples out and ultimately affects everyone.
That is why vegans try to reach others, instead of - as you said - eating their veggie burger and leaving people alone to eat their corpse burger.

All that said, I don't believe in forcing anyone to do anything. And I think MOST vegans see it that way too. Because forcing others is counterproductive. What vegans DO is simply try to inform people about what their daily choices are actually supporting. Thankfully, it isn't hard to get reasonable people with a heart to see that their actions are not in line with their values. The difficult part is dealing with people who after being shown what they are supporting simply don't care, and want to continue satisfying their tastebuds, putting that above all else.