Hilariously, that's become my 5-year-old grandson's go-to response for everything he doesn't want to do.
Me: Eat your dinner or you won't get any dessert.
Grandson: Grandpa, you're a monster.
Me: It's late. Put away your toys away and get ready for bed.
Grandson: Grandpa, you're a monster.
That's the mentality of your typical DU'er. A bunch of 60-, 70- and 80-year-old adults who debate at the level of a 5-year-old. Maybe I'll teach him the word "Nazi" and see if he calls his mother a Nazi when she tells him it's time to take a bath. I'd find that pretty funny, but I doubt my wife and daughter would appreciate my attempt to expand his vocabulary.