[Shane rushes over to Jess at the counter]
LORELAI: That girl’s a freak.
[Jess and Shane start kissing]
Lorelai says that Shane is a “freak” because she kisses her boyfriend in public – something Rory does all the time, and something Lorelai did when she was a teenager! It’s a pretty terrible thing to say about a teenager who is literally right there.
Even though Lorelai doesn’t want Rory to go out with Jess, for some reason she seems miffed that Jess has chosen somebody else, and snipes about Shane (she should be grateful Shane is making Jess unavailable). She may be trying to send Rory the message that only a “freak” would go out with Jess.