That was stupid! If Karkat was as good as he was claiming to be then John would have easily noticed him. It wasn't like he was oblivious of most people... most of the time. He was pretty good about being aware of his surroundings, and he was almost certain that Karkat hadn't done anything to stand out in any way.

Okay, so if he wasn't lying and he was top of the class too, that was technically standing out, but apparently he wasn't doing it in a noticeable way.

"Maybe you're just really boring!" John blurted out. Again, not the smoothest in the way of comebacks, but he could probably expand on that.

"Maybe you're just so boring I don't want to notice you." Okay... no, that didn't even make sense. Maybe he should just trying punching Karkat and see where that got him? That would probably work out better for him than trying to do this verbal battle here.