I think this exemplifies cognitive dissonance at work. I tried to post a Ray Franz quote from In Search of Christian Freedom last night, but I couldn't get my computer to work.
The gist of the quote is that people have to conform their thoughts and attitude to their actions in order to avoid psychological discomfort (cognitive dissonance). The Society mandates a rigid program of "theocratic" activities, and as a natural result, members begin to justify and defend the Society's positions so that their thoughts can be in harmony with their actions. Thus, when confronted with logical fallacies or downright cruel behavior, Witnesses tend to minimize their importance, or in some cases, pretend they don't exist.
The young man seems to have gone from outright denying that shunning of family members is practiced (perhaps justifying this statement by thinking of a few examples where Witnesses ignore this rule and pretending that situation is the norm rather than the exception) to minimizing its importance by saying that it didn't matter because HE would never leave the JWs anyway.
The situation you described doesn't surprise me. I've not surveyed conditions around the world, but from my own experience, I can see that JW youth are particularly ignorant of their beliefs. This is probably the result of some 20 years of the Society's moving away from trying to empirically and Biblically convince members that they have the truth in favor of simply beating the members over the head with messages of obey the Slave at all cost.