It seems that they do not understand what real repentance actually means.
Repenting is turning away, turning away from our sin TO Christ.
When you repent, you do not continue to live in sin.
If you continue to live like that, you have not repented.
From my previous Catholic mind, I thought that repentance meant I was supposed to be sinless. Nothing could be further from the truth. Are true believers sometimes going to fall into sin? Yes they are. We are still in our bodies of death, as Paul said. But, if a person allegedly makes a profession of faith, and there is NEVER a change in their life, I would say they are lying about it. No one will be perfect, till we are with Jesus. My sin grieves me, but I am not even close to being as sinful as I was, when I was a Catholic. I was a grotesque sinner in those days.