The antidote to criticism is to focus on your own weaknesses instead of the other's. Modern cynicism has moved a long way from Antisthenes' belief that virtue was the only good and self-control the only means of achieving it. The modern cynic views life with a jaded eye, convinced that the only motive for any action is rooted in selfishness. This leads him to see all others as self-deceived fools or liars. If he truly believes that all men are motivated by selfish interests, he has abandoned Paul's criteria of Christian love which thinks no evil.
Skepticism is a sophisticated way of saying disbelief.
While we are not called to be gullible, we are certainly not called to be generally skeptical. We trust God with our eternal well-being, it is reasonable that we trust Him along the way. Yet, we love to hedge our bets. Others' acts of faith are often condemned as irresponsible. Our fear of walking by faith is excused as prudence.