[Mishuh]

for us,the terms "jews" and "israelis" means pretty much the same. the fact that calling someone a jew is an insult really irritates us.

An insult works only if the other side feels insulted. I hope you know what I mean. Cracovia's jews (I'll explain why in small letters) is traditionally a nickname, not an insult as such. It came from them having some supposed Jewish roots and very liberal policy towards players of different natyionalities and religion.
And the fact that they called themselves "Jude Gang" and their stadium "holy ground" just means they take it as normal thing. That's just how they are being called, althoguh many don't like it.

And for me Jew and Israeli is definately not the same. Polish grammar even distinguishes these two cases. We write "jew" (small letters) for someone who is of Jewish belief (we write all religions in small letters) and in capital letters Jew means Israeli. That's why Cracovia are called jews (as a nickname), while you're Jews(=Israelis).

I don't really see antisemitism in the naming itself.
But of course some supporters use the Jewish symbols to piss Cracovia off. Why? Because they like pissing Cracovia off, not because they are antisemitic. (surely I cannot speak for everyone, I'm sure there are some radicals hating Jews, but it's just a bunch, don't judge everyone).

Just of curiosity: Do you also think that calling Tottenham Yids is abusive? And the same for Ajax's Joden.