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.