I don't think vegetarians are losers.
I really don't care what people eat. I have more important stuff to worry about than that.
I will admit that I don't really understand, at a fundamental level, veganism. But, at the same time, it doesn't matter that I don't understand, because I also don't care, and they should do whatever they do.
Don't try to inform me, because, again, I don't care.