There is no antisemitism in HP. The whole idea was made up by spin doctors. The dwarves aren't antisemitic symbols either. There were many celebrity antisemitic writers in England while Tolkien was working - Chesterton, Belloc, Eliot, Sassoon for four. They were completely explicit about it, no secret coding. Anyone in Tolkien's position could have got away with it. But he didn't have anything to do with that gang.

Rowling's attitudes to trans people postdate the HP books. And at this point she can afford to take the attitude that any publicity is good publicity.