I'm a jew and before I express the rest of my thoughts I want to say that I do not want to derail this conversation into one about the merits/validity of the comparison of industrial animal agriculture to the holocaust, though I and and other jews have supported the comparison.

It's not usually my topic of choice when discussing veganism with carnists precisely because of how likely omnivores are to get defensive and how much more fraught with controversy that conversation becomes in comparison to other approaches to conversations about the immorality of animal exploitation. That said, I think that banning the topic or anybody who compares animal processing facilities to concentration camps when it's relevant, especially if they aren't doing so flippantly or aggressively, is not a good direction. If multiple holocaust survivors did not agree on the merits of this comparison and it weren't so damn useful for revealing cognitive dissonance and showing vegetarians how they compartmentalize their ideas on the morality of consuming flesh products differently than those on slightly more abstract products that were produced by flesh of an animal that lives on to produce more for its owners, I'd think differently

I think my conclusion is that if people are being respectful in asserting comparisons of industrial animal agriculture to the holocaust and not being flippant then it should be allowed (ie keep the flippancy/attempts-at-dunking stuff confined to vegancirclejerk or c/vegan)

Final disclaimer: I am not an expert on rhetoric or persuasion, but due to my grandpa's obsession with the question of how could Hashem allow the holocaust, I've been to way too many holocaust museums multiple times, and I've seen far more documentaries on the subject than anybody should have to