Apologies in advance, this might be a bit curt.
They focus overwhelmingly Palestinian victimhood, which strengthens the humanitarian rather than liberation understanding of the Palestinian situation. They glorify resistance only if it adheres with the Western obsession with non-violence. They criticize authority without respect for the need for political movements to be strong as well as ideologically perfect. They act as if the Palestinian political system were a Western parliamentary democracy with political “parties” instead of movements. They see only one side of the Palestinian Islamist movement and don’t contextualize it within the complex history of political Islam in the middle east over the last half century.
They see Palestinians as victims, not agents of their own liberation. They see themselves as the centre of the struggle, they think the point of protesting is to take a picture of it and show it to some Americans.
And, as a member myself of a palestinian solidarity movement in a western state, by “they” of course I mean “we”.