That makes complete sense to me. I'm not saying it doesn't exist but personally I have never met overt anti-semitism on the left. ie Hard anti-Jew rhetoric or holocost denial. Plenty of anti-semitic tropes where folks should know better - but I have also seen plenty who, when told they had gone there, backed right off and apologised.
The right on the other hand...
I'm a Brit by the way - but it all applies here.