I ultimately agree with the premise, which is why under any other context I don't focus on Zionists humanity, but their actions and ideology, but this was a quick, slightly snarky, reply to someone saying Zionists make him lose faith in humanity.

A better way to have phrased it would have been "Zionists don't represent humanity".

But also, I don't think a negative comment online about the modern day Nazis being inhuman due to their ideology which denies basic human values is akin to the systemic dehumanization Nazis performed from a position of almost absolute power on innocent groups who weren't conducting a heinous genocide.

Nazis dehumanized vulnerable groups in a genocidal effort. My words are specifically towards denouncing the followers of Zionist ideology for enaging in those same genocidal efforts.

Again, your intentions are absolutely valid but I don't think the whole "this is literal Nazi shit, do better" is necessary and on some level actually lessens the harm of what Nazis actually did, similar to how my comment accidentally leaned into their rhetoric.