I never had any problems (outside the horrible behaviour of border officers who show you that you are not welcome). I was stopped once by a policeman when I did an illegal car maneuver (which is tolerated in France), and when he realized I was a tourist with family, he just said, "Be careful, have a nice trip."
Today I am seriously considering never going to the US anymore because it looks like it is not a good destination anymore. I may be wrong though, I hope.