Don't you mean some Christians act like socially retarded, amoral humanist radicals now? I would even say that "some" is a very small minority. Genuine, spirit-filled, Christ-centered believers would know the proper way to act and would act properly.
Colossians 4:6 Let your speech be alway with grace, seasoned with salt, that ye may know how ye ought to answer every man.
Can’t be a whole Christian without the whole counsel of God.