The snippet quoted above does not say WHAT this man said to be labeled as an antisemite. It is possible that he IS antisemitic. I have not had the same experiences that he has. I have found that one can make valid criticisms of Israeli policies, if they are done carefully and honestly, without being labeled antisemitic. Since he's not telling us what, exactly, he has said that has pissed off the American Jewish population, we really can't say one way or another. It's easy to call someone racist because they disagree with you, but maybe what you said is wrong.
He reminds me of someone I went to school with, who blamed a teacher for being racist for giving him a bad grade. Turns out, this guy was just stupid, and got the grade he deserved.