This is a really good point, yeah. The aphobia in Homestuck... wild.

The absolutely fascinating thing about Homestuck's aphobia, though, is that the quadrant system serves as a critique of how romance is framed and constructed in society and the absurdity of the way we define these relationships. It's a satire, in many ways, of amatonormativity; and it's intentionally framed as ridiculous, multiple times. While we as a fandom have grabbed onto it as something we really like, because it is to be fair incredibly fun to expand on, the framing of it in the comic is very consistently mocking. Genuinely I am fascinated by how such a solid satire of amatonormativity and the arbitrary nature of romance, two very incredibly aromantic talking points, coexists with Homestuck's aphobia.