Not every mention of Judaism is associated with Hitler, so I'm not sure why you ask. Most of the times I hear Judaism mentioned, it is not in the context of Adolf Hitler. I think you're the first person I've ever heard draw a universal connection between the two.
As for Hitler, he is most famous (at least in America) for his violent hatred of the Jewish people, so it is likely that mentioning him will bring it to mind. I mean, what are we supposed to think of? Complaining that Hitler is associated with Jews seems like saying, "Good grief, every time I mention Picasso, people think of Cubist art!"
To keep things in perspective: this is a thread about a "cute" rendering of Hitler, complete with innocent Anime eyes, and the mention of Jews is done in a jovial, playful manner, almost game-like.
We're not talking about an internet meme here, we're talking about mass murder of innocent people, not too long ago. There are still living survivors. So excuse me if I refuse to play along, and slap my knees all the way to the cemetery.
As for Hitler, he is most famous (at least in America) for his violent hatred of the Jewish people, so it is likely that mentioning him will bring it to mind. I mean, what are we supposed to think of? Complaining that Hitler is associated with Jews seems like saying, "Good grief, every time I mention Picasso, people think of Cubist art!"