The nazi rule is simple. In any debate, argument, or other two or more sided discussion, the party(and all others with an associated opinion) that first brings of Nazis is instantly the loser of said discussion, argument, whatever. This is a simple principle that applies to all people in all places.
Party A: I really like German chicks. All tall and blonde and such.
Party B: I'm more fond of shortish brunettes, 'specially the pale ones.
Party C(To B): I agree dude, pale is seksi.
Party B: Plus, German chicks are Nazis. Nazis are fscked up, therefore German chicks are gross.
Party A: Dude, 'nazi rule' you guys both lose.