Does the world still reject the idea of salvation by faith alone today?
Yes. The world remains unchanged and continues to reject salvation by faith alone. It ridicules the concept of faith plus nothing, just as the Galatians turned from Paul's simple Gospel of Grace. Legalism still replaces grace, and those who refuse to stay with Paul's Gospel face the same tragic outcome.
Les teaches that the world has not changed. In 2 Timothy 1, Paul says all they in Asia turned away from him, showing the letter to the Galatians had almost no long-term effect on those congregations. They evidently fell on deaf ears, and later they all turned against Paul. Les explains that they fell under legalism, and consequently none of those churches survived; those cities are left today only in the dust of history. This happened because they refused to stay with Paul's simple Gospel of Grace. Les then applies it: the world today is still the same and almost ridicules this concept of faith plus nothing. He ties this to Galatians 4:16, where false teachers zealously affected them but not well and would exclude them.