It's entirely possible you've met many and didn't notice. Tic's run the gamut. I've had several people in my social circles over the years that have Tourette's

It's entirely possible you've met many and didn't notice. Tic's run the gamut. I've had several people in my social circles over the years that have Tourette's and their tics weren't very noticeable; simple things like neck stretches, or little sniffle noises, or circular eyerolls. All things you either wouldn't notice as being a tic, or happen so quickly that unless you're paying direct attention you'd miss them.