I think the idea that Homestuck is not interested in teen relationships or is doing them to "mock" people who like them is pretty wild...yes, things like Troll Romance are dripping with irony but at the same time, the relationships between the characters are so integrated into the core of the comic. Call it post-ironic or a parody or whatever you want but you can't ignore the relationships on purpose.

And not to be an old they about this but back in the day when the comic was updating, there were tons and tons of anti-shipper fans who thought the inclusion of any relationships at all was a betrayal and Hussie bowing down to or getting corrupted by the shippers. Just wild deranged shit. So I could just as easily make an argument their inclusion is out of spite to these fans.

But I think something that's definitely true is that Homestuck is less interested in portraying healthy relationships than it is showing relationship DRAMA. Homestuck loves the mess but we simply don't spend a lot of time seeing the healthy parts of relationships. It loves to represent flawed characters. It's not done out of spite (well...maybe a little) but I think it's really just a mismatch of comic/audience interests.