Even when Jesus was here, He dealt with people differently, according to their righteousness. The thing was, the people who had "more" righteousness weren’t necessarily the people you might have thought. For instance, Jesus didn’t have many hard words for the prostitutes, outcasts, or "sinners" who flocked around Him. But He said shocking things to the Pharisees, to those who claimed to be the most righteous of all.
The good news, here, is that we don’t have to worry about our sin problems. We don’t have to try to diagnose our sin or figure out a plan of healing. God knows what we need, and He will deal with us according to our level of righteousness. If we don’t have any (which is the category I often think I fall into), that’s okay. He’s got a plan for that! Trust Him!