This piece from The Atlantic goes into the detail of it.

It's an incredibly dangerous lie to be spreading but the tweet wouldn't make sense unless you knew the broader context (the Great Replacement conspiracy theory), which Musk clearly does or he wouldn't have gone out of his way to reply. He has tried to row back on it since but just made his take on this more blatant.

It's saying that antisemitism isn't real but only in the imagination of jewish people, while it's supposed to be a fact that Jews systemiletical work on the eradication of white people, while also implying that jewish people aren't white, so boosting the Nazi argument of some white master race based on genetics.

It's also implying that jews aren't individuals but are all conspiring together.

I won't quote them or link shitter but for those out of the loop, here is the Guardian article on the matter.

A tweet posted by @breakingbaht on Wednesday night read: “Jewish communties have been pushing the exact kind of dialectical hatred against whites that they claim to want people to stop using against them.”

With this you can (start to) decide by yourself.

The second part of the post is not easy to understand for me. it's this :
https://lemmy.world/pictrs/image/34abea74-9f86-4437-9f93-fb7bb64c65a4.jpeg

Pretty sure they’re a grown up not a tween.

So... honest question here. The original tweeter.

Does anybody wanna take a stab at what the heck 'Dialectical Hatred' even... means?
I mean, hatred, yeah. that's obvious.
Dialectical... though is usually a method of discourse that's similar to debating- that is, two opposing view points hashing it out. (it differs some from debating, particularly in the arguments that are considered appropriate- for example, debate allows emotional arguments where dialectics doesn't)

He tweets a lot of things. Gonna have to link to the specific one you are curious about.