The problem with the charge of antisemitisem is that it has become the mamby-pamby political equivalent of homophobic, or of racist. If you don't agree with homosexuals and embrace them not merely as acceptable but as wonderful and heavenly, you're a homophobe. If you disagree with someone of another race over some issue, like if you disagree with Obama over Obamacare, you're a racist. If you don't embrace the Jewish people as the superior beings they are because they are God's Chosen People and believe that everything they do is not merely acceptable but the only way it should be done and is therefore right, proper and just, you're an antisemitic cretin (cretin, BTW, Latin origin: Chrīstiānus, or Christian, still human despite their deformities, and isn't that hilarious).
True antisemitisem is top-of-the-list deplorable. Politically motivated fake charges of antisemitisem is a close second.