That's a well over the top generalisation the which ignores right wing anti-semitism, the BNP and EDL other white supremacists, and neo-Nazis. It reads as a C&P from the Mail comments section or a spiked article.
This from Sage Journals which may not suit your narrative and, although from the US, pretty well matches UK and European attitudes.
"It's mooted that antisemitism is not exclusive to one side of the political spectrum, but rather it acts as a "horseshoe" where the far-left and far-right converge. However, while antisemitic tropes are found across the political divide, studies have indicated that it is currently more prevalent among the far-right, particularly among young white men, and often links to white nationalist ideologies."