I agree. While no one has ever explicitly said that you can’t be a friend of Israel and of Palestinians, it seems to the implicit understanding, and to question that would seem to break some socio-ideological orthodoxy.
I had a glimpse of this when I tried to organize a Jewish Orthodox speaker to come and speak at a local library about Israel and the Christian-Jewish relationship, and also to sell his wife’s beautiful religious art. While I had contacts at the library who were initially interested in hosting the event (including a Jewish one), the event was not brought to fruition during the date scheduled for it.
I visited the library and was surprised to note that they had invited an Islamist author to speak on the same date as our planned event. While I knew nothing of the backstory behind that, it just seemed sad that they scheduled a contrary opinion on the same day as the pro-Israel event, indicating that such views are not compatible. This is just one example of such