The term “blood libel”, I don’t even know what it mean, to be honest, but I’ve never seen it used in a context that isn’t flat out ridiculous.

Blood Libel refers to the antisemitic trope that Jews eat Gentile babies. I doubt you can find anyone that thinks that now, but it was a very real rumor in the past and contributed to very real persecution across Europe

I didn’t know that term either. Now that you’ve defined it, I’m trying to make sense of that commenter. The best I can come up with is “You’re not allowed to call out Israel for murdering children because in the past they were persecuted for a wrongful claim also involving murdered children.” Which is an absolute bonkers claim.