This is exactly my problem...
I choose to eat meat because I want to, because it is something I like to eat. I don't care if a person wants to refrain from eating meat or have a vegan lifestyle. I am happy to accept that, and I would NEVER try to force them to eat meat. It is simply a lifestyle they don't want, so I accept that.
But this force...of saying that I am actually doing something wrong, that I am destroying the World. Quite frankly I don't appreciate it. There are plenty of people who have other lifestyles that are also destroying the world. I don't force them to change.
Let me put it this way:
How many vegan/vegetarians drive cars? - Those driving vegans are contributing to global warming. I don't drive, and I could very easily be forceful about the use of public transport.
How many vegan/vegetarians go on holiday? - Those giant planes are contributing to global warming. I've never been on a commercial plane - but I wouldn't stop them having a good holiday.
How many vegan/vegetarians eat vegetables? - Those vegetables destroy our landscapes, which will turn our beautiful green World into row upon row of dusty unusable land. I don't try to stop them eating vegetables.
And there are plenty more examples like this...
Do you see what I'm getting at?
There are plenty of things in the world that are considered wrong, or destructive, by certain people. But it doesn't mean anyone has a right to get them to change.