None can.
You have absolutely no idea what justification actually is.
These two statements are simply not true. There are lots of things that defile a christian. Now you can say that this behaviour is ignored because of grace, but defilement has occured in the biblical sense.
Secondly we all have an idea of what justification is and can guess what your version is. But your language is trying to demean and talk down to someone. Now these arguments come from good places, people with sincere hearts searching for truth with the Lord. Why is it that such "absolutes" are being used with are simple not true. It neither honours the speaker or the person they are aimed at.