Yo @MsBlaireWhite no I have not read Rowling's book, I'm just gonna go off your description.
Men dressing up as women to attack cis women has always been a common trope used by transphobes, like Rowling, to create panic.
I know you know this, and when you say people...

...are comparing you to a cross dressing man you're being dishonest.
The crossdresser in the book is how transphobes view women. Men who only dress up as women to attack people.
And if the crossdresser was a transwoman, having your only trans character as an evil murderer...

...would be transphobic.

Again, I know you know this and you're just trying to appease your dumbfuck audience to get brownie points from TERFs

So, take care