This is the point I always make to people. Eating meat was a technological innovation that went obsolete 10,000 years ago with the invention of agriculture. It's like insisting that we should go back to driving coal-fired steam-driven cars.
I typically reserve it for these "lol bacon" types that go into other peoples' communities and walk around like they think any of us care what they have to say.
I'm happy to patiently explain anything to curious visitors, but I've got no patience for trolls.
IIRC Reddit lets individual subreddits opt out of appearing on r/all if they feel the exposure will do them more harm than good. I think Lemmy only has the option to defederate from specific instances, and that's not the right tool here.
This 'argument' always annoys me so much. It's the epitome of just responding something, so they can perceive themselves to have won the argument, while they're just completely (and deliberately) ignoring what you're actually saying. They're not discussing with you, because they want to understand, they're rather doing it, because they feel socially threatened.
When someone posted a stupid hypothetical got-cha question, I pose my own: "Would you rather have hands for feet, or feet for hands?".
Sometimes they will forget their question entirely.