Matthew is not telling us how superior we Christians are to Jews. He's telling us how to be better Christians. "You're worrying too much about the unimportant and not enough about the important."
Long before, Hosea had called Israel to repentance by voicing this word of God, "For I desire love and not sacrifice, the knowledge of God rather than burnt offerings" (6:6).
Thanks to Boring and Craddock's The People's New Testament Commentary.