I don't think "rebuke" is too strong a word. Perhaps it's not even strong enough.
Christ was declaring to all the world that from now on his mother and brothers would share the exact same status as all believers -- "whosoever shall do the will of my Father which is in heaven, the same is my brother, and sister, and mother. ."
After that rebuke, it's clear we are to kneel to none but Christ.
= = =
INDEED! INDEED! INDEED!
And the third day there was a marriage in Cana of Galilee; and the mother of Jesus was there:
2:2 And both Jesus was called, and his disciples, to the marriage.
2:3 And when they wanted wine, the mother of Jesus saith unto him, They have no wine.
For those with ears to hear:
Jesus' hour is not the start of miracles -- it is his crucifixtion and victory over death, glorifying the Father.