When you meet someone who is normal but goes from 0 to 100 on the douchebaggery scale when hanging out with another douche. Their douchiness is added on to an existing douche structure creating a whole new level of douchiness.
"Ted was fine until that douche yacht Tim came along, now Ted is just a douche dormer."
A theory stating that if two people are into each other, a big romantic gesture works, but if one person isn't into the other, the same gesture comes off serial killer crazy.
Look, there's a fine line between love and insanity. It's the dobler dahmer theory.