It seems that a popular way to “win” an argument is to belittle your opponent by claiming that the person has lived a “sheltered life.” Because the other person has not lived as authentic and gritty a life as you, the theory goes, he cannot possibly understand all the experience/passion/feeling/moral force behind your position, which is drawn from the quintessence of life itself. Indeed, he has not even earned the right to debate you.
I do not think there is much to recommend this strategy — though I’ve often been tempted to yield to it myself. Each of us has lived an authentic life in our own way, and we have all been deprived of other experiences. We are all sheltered.