I don't think they are joking though. It is sad. But there is a group of Catholics who want to make Mary God.
You can probably find "Catholics" who believe in anything on that basis, and have a website to prove it. There are, however, about 1 billion Catholics, and all believe in the Marian dogmas, without a slightest inclination to deify her.
What is the "membership" in this group? How many peope are verifiably backing this heresy?