I believe it is possible to treat how society perceives a person by preparing the person. Give them the tools to be able to function within society. Instead, we aren't even given that. We are told, as you so succinctly put it, to dismiss what society perceives of us. My experience with myself and with people who are mentally ill is that dismissing what they believe is detrimental.
On the contrary, for alot of people -- especially people with mental illnesses -- disregarding their perception of society's judgement is one of the most important psychological hurdles you can cross. This is most evident in people with body image disorders (some forms of anorexia have this feature) where a person can look at themselves in a mirror and cringe at the harsh judgements they imagine others to be making of them. Borderline personality disorder, as another example, is sometimes characterized by a unquenchable need for gratification and acceptance from others, often as a surrogate for acceptance they feel they did not receive from parents or family members.
As I said, alot of the thought processes tangled up in certain psychological conditions involves certain memories and ideas that have been internalized and amplified through life experience filters. In those cases, it becomes necessary to internalize the idea that you do NOT truly know what others think about you, whether you think everyone adores you (the narcissists) or everyone is conspiring against you (the paranoids), and even if you happen to guess right, your understanding of their thoughts is at least as imperfect as their understanding of yours.
That's an important step, because psychotherapy involves a focussed effort to explore one's hidden feelings and motivating drives, force them into the light of day, reinforce positive traits and discard negative ones. This is very difficult to do if your thoughts are focused outwards on "society" or even just the community/family around you; a good psychotherapist would say "Society has a great many problems, I agree. But we're here to talk about YOUR problems. Society will have to wait its turn."