Are they bank robbers?

The neighborhood kids were playing outside tonight and one of them is going into 9th grade. Some boys he knows rode by on bicycles and he said hello. J. turned and asked him if they were his friends and he said, "not really, they are bad." J. said, "Do they drink diet drinks?" Our neighbor giggled knowing that J. was confused and meant do they drink alcohol. Next, J. asked, "Well, are they bank robbers then?"