I don't think its always antisemitism. But often when pro-Palestine supporters try arguing their case there's no arguments. There's zero attempt to understand the actions of Israel. Then its antisemitism. That's all that's left.
But most often I think its antisemetic propaganda that gets spread and passed around. When it reaches someone otherwise sensible, they might be convinced by the argument. That is still antisemitism. We would never condone anyome committing an act of hate crime, just because they didn't know any better in any other context.
There's now more antisemetic propaganda floating about, on every channel, than ever before. Failure to do due diligence and think critically about it at this time, I think is inexcusable.
I niether tolerate antisemitism due to ignorance or maliciousness. Because the result is the same.
And this is perhaps the most important. Israel controlling Gaza, is at the moment, probably, the Gazan peoples best and only chance to be ruled by a power that cares about them, and offer stability, wise and non-corrupt govornence. So being pro Israel right now is also being pro Palestine. And being pro-Palestine right now, is in practice being pro-Hamas, which will only lead to endless carnage.
If you care about Palestinian civilians the best option is to support Israel