I don't reckon 'intellectually threatened’ can be viewed as a new phenomena.
When Charles Darwin's theory of natural selection, which we know as the Theory of Evolution or Darwinism was being argued-for, notably by Thomas Huxley in his famous debate with the Bishop of Oxford, Samuel Wilberforce on 30th June 1860 at the Oxford University Museum, it could be said that Huxley was challenging those who could claim to be 'intellectually challenged'.
And indeed Darwin was himself subject to efforts to what we now know as 'cancel culture'. Huxley though, like JKR and its appears Dr. Kathleen Stock, was un-cancellerable; that is, they simply can't be stopped.
Trans-genderisms core belief that individuals can change sex, despite the scientific impossibility (at present that is) of doing so, often gets compared to Flat-Earth Theory. And the two beliefs are often compared, not least because both depend on the rejection of critical thinking.
So to some degree the masked protestors can claim a legacy, going back to Bishop Wilberforce, back further perhaps to The Inquisition who tried Galileo Galilei - who were definitely 'intellectually challenged'.