I’ve never explicitly been told that supporting Israel prevents me from supporting Palestinians, however, that’s probably because, growing up it was a given that one would NEVER support the Palestinians because that would be considered equivalent to supporting terrorists. In the past, it was always clearly explained to me that the Israelis were the “good guys” and and the Palestinians the “bad guys”. Now, I would respond by trying to show a person making such accusations just how nuanced and gray this issue really is. I would try to explain the Palestinians grievances, without condoning the violent actions of some Palestinians. I would distinguish between those Palestinians who desire peace and are willing to cooperate and those who are not. I would encourage a persons who claims supporters of Israel cannot support Palestinians to seek out and assist peaceful Palestinians achieve a just resolve to this sad situation.