I am myself supporting many of these protests, and it's exactly from this perspective that I say that many of them are antisemitic. But this is a bit of a useless discussion because neither you nor I can bring any evidence into how antisemitic they are, or how and if they would react if (or when) Palestinians are slaughtering Jews.

If you think it's nonsense, try to go into a anti-war protest with a t-shirt saying that Jews too should be able to live in Middle East. If this thought makes you slightly concerned, you got my point.