It is wrong, we all know that, we have been told, but do we know what it is?
Is it the irrational hatred of the Jewish race and who are they? Hebrews, Canaanites, Ethiopians, Jordanians. If so it is obviously wrong. We cannot hate someone because of their birthright, they had no choice.
Is it the hatred of Judaism, the religion? If it is we are in murky waters. There are many people from many races (ethnicities) who follow Judaism. Why should anyone not dislike the said religion. I dislike Islam, well all religions, but others dislike Christianity, Hinduism, Shintoism... we cannot all be wrong.
Or is it a dislike of the State of Israel? I suspect that a lot of modern day "antisemitism" is against the actions of Israel, the state. As such is it not the antisemitism currently being complained about.
We need to be very clear about this. I know many Jews who I dislike, but I support Israel, yet all those who do not feel the same way are not antisemites in the traditional sense. It is similar to those who are tarred as Islamophobic because of their hatred of the actions of IS but who are not totally against Islam.