nebulaenerd:

Past =/= Present or Future

Do not take a persons past and say that they cannot change.
Do not take a persons past and say that will ALWAYS be how they were and they cannot have changed.
Do not take a persons mistakes and keep shoving them back into their face.
Do not insist the person is bad or tell people they are if they made a mistake in the past.
If a person learnt from their mistakes, that is all that matters, and that they put that lesson in to practice.

We are human, beings. We make, mistakes. We learn from them.
We all make mistakes we want to move on from, so what right do you have to shove another persons past in their face again and remind them? None.
So don’t.