First, culturally Black folks, especially the diaspora have always had a soft spot for any oppressed peoples. We sympathize with South African blacks, Hong Kong Gen Zers, Iraqi civilians being bombed, whatever. If you are being oppressed culturally we feel for you.
This also goes for the Arabs in the occupied territories. If you are Black and oppressed we speak out publicly. If you aren't we feel for you from a distance: Hong Kong, Iraqi civilians. We have sympathy for any mass attack on Jewish synagogues in America. Rappaport conveniently forgets that. He conveniently forgets the CBC (Congressional Black Caucus) has fully supported Israel even when they had members who were Moslem.
Secondly, his DEMAND that we are to just openly and publicly ride is coming from a place of condescension. It comes from a person and a people with a mindset that feels they and their people have power over you. It's not a statement that comes from an equal but a statement that comes from a person who feels they have power and that power is greater than you.
The fact is the Israeli government has been oppressing these folks as well as black Jews and others internally. Culturally, we don't roll with that. He is seeing lack of support as anti semitic because he's emotionally about the issue, which I get. He can't or won't understand we stay out as a group in some part because we now know better than to speak out publicly because we already know doing so we lose. We aren't stupid. Either side publicly you lose. And why? It's better to stay quiet. At least those of us who take the 3 degree chess game.