If you reject the Jewish identity then why do you say "Jew here"? What does it mean to be a Jew exactly?

And how can you tell me I don't speak for any other Jews when that's precisely what you are doing when you say, "This guy doesn't speak for any other Jew"?

And why does your Jew card overrule mine? Not that I've even played mine, but I'm a Jew too. What gives you the right to say "Jew here" and try and overrule anything I might say about the Jewish identity, as if my opinion doesn't matter?