LORELAI: I’m sorry. I thought you would be happy about this [that Lorelai invited Dean to their movie night].
RORY: In what universe would I be happy? This isn’t Amish country. Girls and boys usually date alone.
In conservative Amish groups, teenage couples might be expected to date each other with groups of friends, or even with their parents accompanying them. However some Amish teenagers do go on dates alone, at least sometimes. The most conservative Amish of all practice a form of dating where the boy and girl talk all night in the same bed, fully clothed, and with no touching. (Yet when Rory and Dean tried that, all hell broke loose!)
When people say Amish country, they usually mean south-eastern Pennsylvania.