I cant say every person you encounter and tell about your sons TS is going to react in a positive way. Like steve said, its the person who reacts in a bad way who has the problem. I will for the most, most people I encounter and I bring up my TS to, I get a positive reaction. By that I mean they understand that it is a disorder and though they may not know what it is but hey understand its something I was born with and not something to judge me by. Some even want to know more(I actually like those people, get people to understand TS)
As your son being young it may be harder maybe at school or other situations where kids his own age are with him but lets be honest, when your that young, any "different" thing someone has is right for teasing. As people get older, those ignorant become the few. I would say honestly my hardest "social" situation with TS is when Im around people I dont know and I dont plan on introducing myself or even talking. i.e. waiting in line, sitting at a resturant. But you finds ways around it I guess.
The other day at a local grocery store, I saw a rack with books on it and one of them said, "pregancy for dummies"............