I think there's an extent to how much you're "supposed to" read into Homestuck. Can you read in further? Of course. Always. People may say it's cornplating but shit, I didn't see that plate of corn either, please tell me about it.

Personally, I think there's a line when you start trying to insist that some of these really little or niche things are ONE HUNDRED PERCENT INTENDED. Sure there's a chance but sometimes the curtains really are just dicks. Never intended to be anything more, but I'd still like to hear how you think they connect into the story.

Maybe that's a bad example to use in a story that literally has plot relevant colored curtains for each act.