I grew only eating cooked vegetables and peeled fruits. We washed our grapes, plums, apples, pears etc thoroughly before peeling each of them. I did that for the first 30+ years of my life. It was only in the last 20 years or so that I started eating some salads and eating my fruits without peeling them. I still scrub the the outside of papayas and melons (water melon, cantaloupes...) with soap and water before cutting them up.
There were (still are) some places in this big ol' world where cooking, or peeling is the only sure way to avoid some really nasty stuff, like dysentery & cholera. Parts of Asia still use human waste as fertilizer, or it is just local custom to relieve one's self out in a field. If someone is going to eat something from downstream, so be it. But REALLY, the OP was in a Whole Foods, in the organic section, and while I can't be totally sure where those grapes came from, if I'd been there, with my healthy immune system, if probably have tasted a couple too.
re: washing melons. Good idea. They grow in contact with the ground, and a knife sliding through their skin can easily drag surface stuff onto the sweet flesh inside.
And now my pet cooking peeve. Cracking eggs on the edge of the bowl. Ever notice it pushes egg shell way into the egg? Know where that egg shell came from? So crack your eggs in a flat surface, like the counter or the stove, but so that you don't push possibly contaminated egg shell into the white.
Jim