NOPE not in the least, there are tee shirts out there that deter people from touching your belly.
this one is cute it charges people to touch: http://www.designmom.com/2007/09/don.html
I really liked this one: http://www.cafepress.com/jazilla.185179523?CMP=CJ-CLICK-10467594
Maybe you could rub their belly when they touch yours. Since they see no problem invading your space, invade theirs and maybe they will get the hint and stop doing it
I know exactly how you feel and agree. I have had complete strangers come up to me at places like the store or gas station and ask how far along I am and can they touch my belly. I flat out say firmly "NO".