I have no problem if people want to be vegan, but they should also respect the rights of others to [i]not[/i] be vegan. It's the same principal as religion -- you can believe in the Flying Spaghetti Monster for all I care, but you have to be respectful of my right to choose to not believe in him, too. You can't ask to have your beliefs respected and then blatantly trample on the beliefs of others. It's one thing to have an open discussion about differing beliefs (it can actually be fairly interesting/enjoyable to do), but the minute someone goes and starts slapping a milkshake out of someone else's hands, that crosses a line.