It shows a rather unpleasant misogyny. That a man thinks someone as fiercely intelligent and articulate as JKR could veer so wildly off piste from what is the main theme of 7 entire wildly successful books that I presume Lithgow has read (if he's going to be acting in a show about them). On a feminine whim, presumably.
When in reality of course her position on women's rights is entirely consistent with the central themes of the HP books. Truth, honesty, fairness, fighting for justice even when it's hard, extreme bravery in the face of people shouting you down.
I mean she couldn't have predicted more clearly what's happened to her in the treatment of Harry when he's speaking the truth and everyone's smearing him for it.
The fact it doesn't cross his mind that things people have told him about JKR might in fact be wrong and in fact her views may be entirely consistent with the HP universe and doesn't bother to find out for himself out of pure self interest is just misogyny on steroids.
There is no fucking way he'd be saying the same thing about a male author.