Why do so many people now use “woman” as the plural instead of “women”?

Yesterday, I saw a video of an English teacher in her 40's who CONSISTANTLY said, "WOMAN" every time she was talking about more than one woman and I hear this CONSTANTLY, the past year or two!!! An English teacher of that age should know better!! Who the fuck is teaching everyone that "woman" is plural instead of singular?

Why do so many people now use “woman” as the plural instead of “women”?
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