Rowling's statements have changed my perspective on the HP series in general. I still think the books are good, but my doubts regarding the how I see the story have grown. The wizarding world was rotten to the core, and that while individual wizards could be perfectly good individuals, the society they'd established was based on discrimination, bigotry, and elitism.

The HP books do not follow through on their promises. They spend a significant amount of time on tolerance and understanding, as well as how it doesn't matter how you were born, but rather what you choose to do, and how discrimination is wrong. But then they exhibit that it does matter how you were born, and if you aren't one of the few born into luxury, you are completely irrelevant at best, and more likely absolute filth who deserve scorn, mockery, and prejudice.

When reading the HP books with JKR's transphobia in mind, certain portions are directly difficult to read. I don't believe art and artist can ever be completely separated since art represents how the artist perceives the world. And that, not from an activist's point of you but from a reader as well.