hot dogs and ketchup

this morning i was listening to AC as i always do and he mentioned that you get to a certain age where you don't put ketchup on hot dogs anymore.. when did this become a rule? and why wasn't i notified. i like ketchup on my hotdogs, and thought it was just my dad that was strange in not liking ketchup on his hotdogs.

apparently it's not just a personal preference thing but a widely known faux pas...

how do you eat your hot dogs? ketchup or no?