The people you're talking about are idiots, and in regards to experienced adult bicyclists, you are totally wrong.
Part of why you are wrong is probably because experienced adult bicyclists act like a vehicle instead of a toy and it freaks out car drivers when they have to change lanes to pass a bicycle like they would if it was a motorcycle, or when a bicycle makes a left turn by moving over into the left turn lane as a proper vehicle should. So if you encounter a bicycle with no lights at night or other stupid childish behavior, please remember that intelligent grownups ride a bicycle like it's a vehicle and the people you're complaining about are ignorant childish fools.