What Can Seinfeld Do to Prove He Isn't Transphobic?

What can Seinfeld do to prove he isn't transphobic because of his one joke? He's the creator of the show Seinfeld. I just asked him a question. Did Hitler have a single positive achievement? And it says, as a language model, AI, I do not have personal opinions,. It is widely recognized that Hitler and his regime responsible for horrific crimes including the genocide of six million Jews during the Holocaust. The answer should be like, one would only ask that question if they were up to something. Can't they just introduce a trans character to the show? A chat GBT trans character. Imagine that on the one.