Well what are you hoping to accomplish?
What you're suggesting has only ever, so far as I can tell, resulted in a kind of whitewashing. It has never produced less sin, just less obvious sin and a whole lot of resentment.
>Im asking because there is someone I know who holds the notion that they are forgiven and should not be called a slut, despite giving many many reasons as to why they should. They have no basis for their opinions as I believe it is no different than calling someone who steals a thief, or someone who kills a murderer.
Repentance literally means "turning away". So if they have repented, then your attitude is absolutely wrong, and will only engender resentment. You are potentially doing very much harm with this attitude.
>All are held accountable for their sins and should be responsible to the repercussions of them even if they are earthly bound social repercussions, otherwise their would be no moral ground to even have such acts be conceivable as sins.
It seems to me that you're very eager to punish. This in and of itself is a sin, unless you yourself are perfect.
>otherwise their would be no moral ground to even have such acts be conceivable as sins.
If the only reason you can come up with for why a sin is a sin is "society will hate me if I do this" then you need to work on your faith.