Therefore thou art inexcusable, O man, whosoever thou art that judgest: for wherein thou judgest another, thou condemnest thyself; for thou that judgest doest the same things.
But we are sure that the judgment of God is according to truth against them which commit such things.
And thinkest thou this, O man, that judgest them which do such things, and doest the same, that thou shalt escape the judgment of God?
I think this is rather clear. Paul is telling new Christians that it is the height of hypocrisy to sit is judgement of another. Why? Judge a person for lying? Have YOU ever lied? Judge a person for coveting? Have YOU ever coveted? Judge a person for stealing? Have YOU ever stolen?(yes, that stick of gum counted)
Paul is saying that God is the ultimate judge, and because we are all imperfect, we should STFU.
Romans. we shall all stand at the judgement seat of Christ.Try reading instead of googling.