As a "Calvinist" (I prefer label reformed Christian) it appears as though you have totally misunderstood Calvinism. One of the bedrocks of Calvinism is that every person in his natural state is fundamentally bad and any spiritual/material blessing is undeserved so how could we could we boast?
Commentary from John Calvin on Luke 13:4 where Jesus comments on whether the 18 people killed by a falling tower were bad people because they suffered this fate:
"This passage is highly useful, were it for no other reason than that this disease is almost natural to us, to be too rigorous and severe in judging of others, and too much disposed to flatter our own faults. The consequence is, that we not only censure with excessive severity the offenses of our brethren; but whenever they meet with any calamity, we condemn them as wicked and reprobate persons. On the other hand, every man that is not sorely pressed by the hand of God slumbers at ease in the midst of his sins, as if God were favorable and reconciled to him. This involves a double fault; for when God chastises any one before our eyes, he warns us of his judgments, that each of us may examine himself, and consider what he deserves. If he spares us for a time, we are so far from having a right to take such kindness and forbearance as an opportunity for slumber, that we ought to regard it as an invitation to repentance."
Commentary from John Calvin on Luke 13:4 where Jesus comments on whether the 18 people killed by a falling tower were bad people because they suffered this fate:
"This passage is highly useful, were it for no other reason than that this disease is almost natural to us, to be too rigorous and severe in judging of others, and too much disposed to flatter our own faults. The consequence is, that we not only censure with excessive severity the offenses of our brethren; but whenever they meet with any calamity, we condemn them as wicked and reprobate persons. On the other hand, every man that is not sorely pressed by the hand of God slumbers at ease in the midst of his sins, as if God were favorable and reconciled to him. This involves a double fault; for when God chastises any one before our eyes, he warns us of his judgments, that each of us may examine himself, and consider what he deserves. If he spares us for a time, we are so far from having a right to take such kindness and forbearance as an opportunity for slumber, that we ought to regard it as an invitation to repentance."