It's not exactly the same thing to the extent you can bash and hate England, yet like the English. Have you seen people despising Netherlands, but loving the Dutch? Sanders is ultra left, so is Noam Chomsky and many notable Jews in the U.S. You are probably aware of the terrifying phenomenon - self-hating Jews. Some of them hide behind the term "anti-Zionism" which is effectively a form of latent antisemitism. It's quite wide-spread among neoliberals these days. Waters has long jumped this bandwagon filled with hatred towards Israel, because it's a trend among rock musicians (and academia, obviously). They are all brainwashed by each other, Amnesty International, UN, etc.
Antisemitism manifests itself in a variety of ways - social, economic, religious and political. Today antisemitism is fueled by different groups for different reasons. Waters belongs to the group of liberals that are proud of showing the Stars of David falling along with swastikas and bombs during his show. This propaganda is more hurtful and damaging to the Jews in Israel and around the world than common slurs directed at the ethnicity. I think you know what I mean.