Stripes at the Great White Throne Judgment

In the Second Resurrection or the Great White Throne Judgment, God will offer salvation to all those who died without having been called. But what is meant with the stripes which some will receive? Why will it be more tolerable for some than for others, and why will some receive greater condemnation? Will God just ignore the horrible crimes and atrocities of mass murderers and perverts? What is meant with the statement that tax collectors and harlots will enter the Kingdom of God before the Pharisees?