In Romans 2:1-5 Paul addresses this very same attitude.
"Therefore you have no excuse, O man, every one of you who judges. For in passing judgment on another you condemn yourself, because you, the judge, practice the very same things. We know that the judgment of God rightly falls on those who practice such things. Do you suppose, O man- you who judge those who practice such things and yet do them yourself- that you will escape the judgement of God? Or do you presume on the riches of his kindness and forbearance and patience, not knowing that God's kindness is meant to lead you to repentance? But because of your hard and impenitent heart you are storing up wrath for yourself on the day of wrath when God's righteous judgment will be revealed."
I love that God's kindness is meant to lead us to repentance. If we ask God to forgive us, He will! What is more astonishing is that we can pray "Create in me a clean heart, O God, and renew a right spirit within me." Ps. 51:10 So you and I don't have to be burdened down under our sin but can start anew each moment. What a wonderful truth!