Catholics can’t “get” your objection because you persist in GROSSLY DISTORTING the meaning of “Mother of God.”
Since your distortion is not what Catholics believe, your constant repetition of that objection is 100%, absolutely, totally irrelevant.
When you can ACCURATELY STATE WHAT CATHOLICS BELIEVE, then any objection you may have might be interesting.
As long as you continue DISTORTING the meaning of the title “Mother of God,” then your objections to it are misdirected, pointless, and uninteresting.
It is exactly as though you stubbornly kept saying, “Catholics believe the Pope is a flying monkey. I keep EXPLAINING to them, OVER AND OVER, why the Pope isn’t a flying monkey. But they just don’t listen to me!”
Then define Who is God.