"For all you who were baptized into Christ have clothed yourselves with Christ, there is no longer Jew nor Greek, male nor female, but you are all one in Christ." (Galatians 3:27-28). This is an even bolder claim, an even nobler idea -and this is do-able. It is an effective idea because it began in the mind of God and is accomplished by His power thorough Jesus Christ. In God's plan we do not lose our distinctions - they simply become irrelevant as we take up our crosses each day.
Some of us do not take up our crosses, and we still see each other (our own brethren, purchased with the same blood as we were ) as less than ourselves, separate from ourselves, not up to our level, somehow inferior. If the distinctions between us persist in our hearts, Christ is not resident there.
Plants placed in a room will grow towards the sunlight. Their roots are differently located but each from its comer will grow in the same direction. Even so, we from our different pasts, our different views, our different cultures, and preferences grow towards the Son. "But speaking the truth in love, we are to grow up in all aspects, into...Christ." This is real, an un-legislated, transformation by the Spirit in us.
Has this been our experience?