The conference was supported by Hamas.
On Friday, PA religious affairs minister and top Abbas aide Mahmoud Habash said that the conference was a "meeting of Satans."
Naturally, Hamas had to answer this insult. And what better way to do that than to make Habash look like a Hasidic Jew?
The poster quotes Habash as saying ""Palestinian blood is like Israeli blood" and calls him the "Minister of Jewish Temples in Ramallah."
This is the worst insult that Hamas can come up with for Habash. To call him a Jew is obviously much worse than calling people "Satans."
(h/t Ibn Boutros)