There's really no response to something like that other than what you gave, or maybe "You have just heard one side of the story." You know I once worked at the equivalent of the DMV here in Canada and I had tons of calls from Moms arguing over their sons' speeding tickets and things - saying ridiculous things like that the police targeted their darlings, and I'd be like "Oh, were you in the car at the time?" They never were of course. And they never called about their daughters, only the sons - their darling boys could do NO wrong. I just had to say to one of my co-workers that I'd had a "Mom call" and they would roll their eyes. That's how common it was.