I feel that you make certain mistakes in this post. I will try to delineate them.
1. "There is hardly any, assuming that you meant anti semitism."
I am a Jew. I have lived the life. I still see plenty, from swastikas painted on my parents' synagogue to firebombs thrown into a local rabbi's house, to cemetery desecration, to having unpleasant things yelled at me on the street (and pennies thrown at my head). I live in the NYC area -- I'm talking about overt acts even where there plenty of Jews. Things get even more dicey when you move away from a metropolitan area. You may not see it, but don;t dismiss it. It is real, and plentiful, unfortunately.
2. "It has been going away since WWII"
That's sadly not the case. While certain institutional types have reduced, in some places, there is an actual uptick in incidents and anti-Jewish feeling. Jews are fleeing Europe and feeling the heat in the US. We aren't making this stuff up. People really do shoot up JCC's in Kansas City and schools in Toulouse.
3. "Plenty of people are obnoxed by Zionism without having any problem with Judaism"
Actually, plenty of people claim to have a problem with Zionism and not Judaism and then openly cross that line because they conflate the two. Matisyahu wasn't kicked off the music tour because he is Israeli. Propaganda cartoons don't depict Israelis, they show Jews. Anti-Zionism is, for the most part, thinly veiled anti-Semitism because the Zionist movement is about autonomy and a homeland for Jews. To say that one is against Jewish autonomy and the right to self determination, and yet not against the religion that aspires to such things is ludicrous. But, still there will be plenty who try to distinguish anti-Israeli governmental policies with anti-Zionism and that's fine. Heck, most Jews are against some (many) aspects of Israeli politics. But to be against Zionism is to be against the right of a people to exist in a country because their aspiration is rooted in religion. So a problem with Zionism is, in effect (and in most cases) a problem with the religious belief of Judaism.
4. "Opposition to west bank settlements is considered antisemitism, or anti Jewish, when it isn't."
Mostly, it isn't. I have yet to see any Jew in my neck of the woods claim it is. Opposition to Jews living in various parts of Israel has nothing to do with anti-Semitism, except that it, as stated, denies that Jews have the right to live some place in particular just because they are Jews. And, hey, that's not anti-Semitic now, is it?