Just like you cannot be racist, sexist, ableist, disableist, homophobic, transphobic, classist, capitalist - and leftwing, lol. You get the point.
p.s. this list isn’t exhaustive. Stop being a shitty human.
p.s. 2: Go vegan, carnist scum.
Edit: Please, whoever is spamming, put more effort into your troll posts. None of us stan Peter Singer. Is a piece of shit.
I do wonder - can I be a racist asshole and be leftwing then?