I loved this, and I loved it being a secret cosplay episode. Sad retail cringelords being backed up by valiant nerd armies! Truly amazing. I could envision so much of it, down to Karkat's homemade horns. This episode really hits on what I find funny/reprehensible about nerd culture, particularly when it comes to male cosplayers, who are sleazes and white knights across the board.
By far my favorite in a while. Awesome work, and it's good to hear Achillies' Heelies again!