you must be from the north

i phrase used by people who live in southern cities(e.g. Nashville, Atlanta, Savannah,Raleigh,Dallas, Birmingham, Floridian cities do not count)
it is used when someone says or does something or extreme oddity of a southerner while in the south

guy1: i prefer pepsi over coke
guy2 : you must be from the north

person1: i hate sweet tea
person2:you must be from the north

human1: i like professional football over college football
human2: you must be from the north