Not Ashamed
Jesus is saying in Mark 8:38 is that those who are ashamed of Him in an adulterous and sinful generation, have their values wrong. Jesus is pure, holy, good, and right. We should feel good about knowing Him and associating with His body, the church. If we find ourselves ashamed of Jesus and His people, we need to examine ourselves. The fault is not in Jesus, but in ourselves for honoring the wrong values.