That teaching is blasphemy against God and an affront to the sacrifice of Christ on the cross and what He endured to apprehend forgiveness for us.
I don’t think these teachings about the Blessed Virgin Mary are blasphemous for they edify God the Father, God the Son and God the Holy Spirit.
Where are you getting the idea of blasphemy? From propaganda against the Catholic Church? From pamplets? From some uneducated preacher of whom we are told to be aware of false prophets?
Please explain where you are getting these errorneous ideas.
The Blessed Virgin Mary always edified her Son and God the Father. Have you ever read the Magnificat? Total prayer of praise.