If one cannot be respectful even to ratchet jawed lowlifes for the sake of marriage, then we have dissed something that is even worse to diss: God.
Momma has to establish the ground rules early. Remember, they are getting MARRIED. Momma may see that as a ruse for that gold digging tramp to get son’s vast financial empire.
Momma needs DIL to learn who is in charge. Nothing shows that better than a azz-kickin outside the bridal shop. DIL needs to play her position.