Anybody who had a parent should know the rules of “everybody does it.”
Rule One: It’s not true. As your mother asked, “Who?” (Didn’t have a good answer, did you?)
Rule Two: It’s irrelevant. “If,” as your mother said, “everybody drove their cars off a cliff, would you do it too?”
Rule two doesn’t come into play with this. Because Rule One has already taken it out of contention.