If you live well, why are you still a sinner?
We only see the outside and can not conclude much from that. Two people can do the same thing and that in a completely different way at the same time. It is about the intention with which we do something, about the ulterior motives and the desire that we have. The Lord looketh on the heart.
Therefore there is no point in trying to figure out if someone is sinning by looking at deeds and what you have been done wrong. Those are only symptoms and when you focus on them, you are not occupied with the illness itself. If you manage to suppress those symptoms, the illness goes inside and you become a hypocrite. The apostle Paul does it differently. According to him sin must not be taken out of us, but we out of sin. First the tree, then the fruits.