Yeah, your take makes perfect sense to me. I'm just letting you know why your original message gets interpreted negatively even by people who would otherwise agree with your message.
Take a minute to think about it. What's the intention behind quoting this specific passage instead of another? Is it a continuation of your first statement and you're providing this as the reason you support anti-speciesism (i.e. that you're not racist/sexist)? Or are you trying to tell others that they're racist/sexist for being specieist? Or are they completely disjoint and you just wanted to share a fun fact? Or maybe you intended something completely different? But I can't think of how else to interpret it, so if that's the case, you'd have to elaborate.