I imagine part of the reason I rarely get sick is that I've never done this, and my parents never used to wage chemical warfare in the house, so my immune system has been exposed to plenty and has thus built up adequate defences.
I have a friend whose parent was the exact opposite of mine in this regard. Guess who gets sick all the time?
Things like antibiotics are given out too readily. People should man up. And not just because it's the cool thing to do, we're simply setting our species up for disaster at the moment.