Actually, when I was younger I thought that in special diet names like pescatarian, it meant vegetarian + fish (I know it's paradoxical, but there you go).
And a lot of vegetarian products are labelled "ovo-lacto-vegetarian" in my local supermarket, which is sort of redundant. Therefore I imagined that vegetariands didn't eat eggs or milk.
There's a lot of wrong info out there, it's easy for some to get confused :P
That comment would have made me so mad. I would have left the room too and gave them the silent treatment (as I have done with a few friends who said somethings VERY out of line), but first asking them how "useful" they think they really are to society if they want to play that game. Why does it matter how "useful" you are to society, why don't you just matter because you are you?
I just could never entertain the notion that a being has "worth" or "use" in any kind of context. The thought of quantifying and categorizing a life based on it's "usefulness"... it makes my head explode. It makes absolutely zero sense.
If you are going to keep animals then you are going to have to feed them, and that will have some negative environmental impact on this planet.
If I won the lottery, I would like to keep pigs and chickens etc. just to show to myself that they don't need to be exploited to have value.
I've encountered that before, people who think folks need cholesterol and a fairly large amount of salt. I think the reason is the clumsy way the RDA is structured. Most RDA's refer to the recommended daily intake, but a few refer to the recommended maximum daily intake. However the labels never say that, so people actually think they need cholesterol in their diet and need a fairly large dose of salt every day, year round.