We don't want these nice people to be embarrassed. Help these people out. This is not my hour, its not my time. Jesus isn't a little boy anymore. His mother just can't boss him around anymore.
Parents have to learn to eventually back off and respect their children's privacy.
As a child grows further into adulthood, ideal a mother becomes less and less a caretaker and more and more a friend. But the transition is never a clean one. It always is in fits and starts. Everyone in the family has to learn their changing roles by trial and error. Mom pulled a power play.