It is rude to tattle on people.
Dave's older brother Mike often has friends over.
Dave wants to be noticed by his older brother and his friends.
Dave asks to join their activities and talks about their common interests.
Dave tattles on Mike and his friends every time they are over.
Mike and Dave have the same group of friends for their childhood and beyond.
Mike does not trust Dave, so he ignores him and will not let him hang out with his group of friends.