Why do Catholics honor Mary? We are called to imitate Jesus for He is the Way, the Truth, and Life. We are called to love what Jesus loves and to hate what Jesus hates (sin). We are also called to honor whoever he honors. Jesus honored his mother otherwise he would have broken the 4th commandment (honor your father & mother).
And he answered them, saying, Who is my mother, or my brethren? And he looked round about on them which sat about him, and said, Behold my mother and my brethren! For whosoever shall do the will of God, the same is my brother, and my sister, and mother." -- Mark 3:32-35"And the multitude sat about him, and they said unto him, Behold, thy mother and thy brethren without seek for thee.