I'm assuming you mean foreign titles, like, say, European nobility, since there's a dearth of titles awarded in the US. I could declare myself the Marquis of Virginia, and have as much legal standing as the guy in the cube next to me who wanted to outdo me and be the Duke of Virginia, Grand Poobah of the Appalachian Mountains, and Death of Mosquitoes.
Though you have that problem in the US, not so much with elected titles (not many people pretending to be the Mayor, unless they live somewhere that doesn't actually have one), but plenty of "Doctors" who don't have any kind of terminal degree.