An amusing thing I have noticed is that "stare" that you are describing usually takes place over the can of diet coke they are drinking as I am talking. Now there's some poison for you!!!
Some wise guy named Jesus said that if people don't want what you have, shake the dust off your sandals and find people that do. I don't spend too much time anymore explaining. I state my benefits, a brief history, then write down one or two websites depending on level of interest. Iodine4health.com and/or Curezone (if I see a higher level of interest), and breastcancerchoices.org if someone has interest in those issues - then I back away slowly. I feel for people who don't get it, but after a lifetime of caretaking others, I can't afford to worry overmuch.
Keep it up, guys.
Please remember our fallen on this Memorial Day,..