I have read this precise claim from Protestants right here on FR. I.e., that Catholics worship Mary as a goddess.
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Catholics themselves will explain that this is false. Go to the Vatican website and you will find that what other FReepers may have claimed is not true. In fact, the Church teaches against such foolishness.
I’m not 100% sure that you know what “straw man argument” means.
The claim, by Protestants, that Catholics worship Mary (and other saints)—i.e., that Catholics are taught to commit idolatry—is quite common. It is a claim made frquently right here on FR.