RORY: You know, this is a dance marathon. You’re not supposed to come and sit and watch, you’re supposed to dance. He’s just trying to bug me, sitting there right in front of me, staring. Jerk.
People are supposed to watch the dance marathon – Rory was even saying that she couldn’t dance with Lorelai because she had to watch with Dean. Until recently, Dean was also watching. Rory is sick with jealousy and hasn’t slept for more than a day, so she’s not exactly being rational here.
The Annotated Gilmore Girls 