Like I explained in the post, I've tried saying those things before, and they almost always lead to "oh, what's that?", and when I start to explain, the person quickly loses interest. Of course, if they ask why I do it or what it's like, I tell them. And if they see me eat meat and ask, I tell them. But otherwise, I don't risk wasting both of our time.

Good idea! Maybe a whole new one-word term is needed.