re: wolfkitty there's death/rebirth motifs all over the story tbh -- Skaia's process of destroying worlds to create anew is one, god tier ascension is another, the Mother Grub's head is a giant skull... it's a potent motif.
I find the mapping of hate speech to large plot beats plausible partly because Homestuck is referencing stories that have already done the same... like the movie Deep Impact, which John references in Act 1 to crack an Obama joke. That movie's about a giant tidal wave that floods the earth, but on an emotional level this doomsday scenario kind of represents the panicked attitudes of racists for whom the presidency of Morgan Freeman is effectively the end of the world. There's an early scene where a reporter tries to find information on the ELE (Extinction Level Event) and is instead confronted by advertisements for black musicians (Ella Fitzgerald, Duke Ellington), sound systems ("THE WAVE OF THE FUTURE"), and beach vacations ("You've got some OCEAN coming!"). In combination, these link black sound waves (like Freeman's voice) to the coming tidal wave. The reporter's main emotional conflict is that she doesn't like her dad's new wife -- i.e. she doesn't like a new figure of authority in her life! The stepmom's advice to her unhappy daughter is the same as Freeman's advice to a country panicked over the coming flood (and therefore implicitly over his presidency): "Life will go on" ie you will get over it.
I think Homestuck kind of carries the torch of apocalypse-as-venue-for-confronting-ethnic-tensions forward when the first figure we see on the sandy ruins of Earth is a BLACK* DEMOCRATIC OFFICIAL in the form of the Mayor. Him introducing the Sburb motif where White is destined to lose to Black (in chess!) is colored by the same panicked racial anxieties that were being discussed in Deep Impact. The same goes for the Planet of the Apes references on the cherubim's post-apocalyptic wasteland imo -- all those Statues of Liberty lying in the dunes. That was another story using scifi to talk about race... oh and the stamps on PM's letters are from Rhodesia, an African state that underwent a civil war as the colonial government resisted a push for democratic rule (which would shift power from the white minority towards the black majority). Lots of references to anxiety about black leadership
Sorry that this deviates from the antisemitism topic -- I think Homestuck is engaged with a number of different ethnic tensions and inflammatory social conflicts, and I felt like attempting to demonstrate that would be the quickest way to strengthen my case for the previous post