My parent implied there was something "worse" about a "Jewish socialist" - ie because of his birth parents, in part, Bernie Sanders is a worse candidate.

Maybe it's an honest question but I suspect you're simply choosing to be pedantic with the definitions.

https://en.wikipedia.org/wiki/Racism is peppered with references to the persecution of the Jews, so evidently others would file it under racism. Either way, my parent's comment was out of line.

Bernie has described himself as a "secular Jew who does not practice any religion". So if he doesn't practice any form of Judaism, to what extent can you say that his Jewishness is not racial? What else is it?