In many Reformed churches (and I would venture to say most churches in general), the hypocrisy that offends people is not so much that you sing like a saint on Sunday and then swear like a sailor on Monday. The hypocrisy that others find repulsive is when the church proclaims to be a grace-filled place, but in reality only has grace for people who look and talk like them. We deceive ourselves right at the very place where the gospel matters most: None are righteous, but we are saved through grace alone as a gift (Rom 3; Eph 2), and therefore we live a life of ongoing repentance.