Mary Sue’s have always been with us in one form or another.
The first one I can recall running into was Harriet Vane. She was a mystery writer in the Peter Wimsey mysteries by Dorothy L. Sayers. Vane was created and inserted because Sayers had fallen in love with her own creation, Lord Wimsey.
You can undoubtedly think of many others yourself.
But this new breed of Mary Sue…The Social Justice Mary Sue is something new and a lot worse.
The Dark Herald 
The MGTOWs and spergs will of course blow the response. A slightly denigrating quip then casual indifference, then if Mary Sue rotten warrior persists you tell her to double down you don’t care. Then the most important thing, WALK and don’t look back.
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No, Harriet wasn’t a Mary Sue. A wish-fulfillment self-insert, yes, but not a Mary Sue; indeed, I’d go so far as to say that she couldn’t be a Mary Sue because she was a wish-fulfillment self-insert. Because, of course, a true Mary Sue would have inevitably usurped Lord Peter’s role and solved all the crimes for him – and that no wish-fulfillment self-insert could do, because Sayers wanted to marry Lord Peter Wimsey, not some emasculated shadow of him.
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