While I don't think they're right that Iran is ignored because Iranian protesters and the Iranian government are both perceived as white by Americans (or both non-white, depending on the person), it's undeniable that they use the perceived non-whiteness of Palestinians and perceived whiteness of Israelis as rhetorical ammunition.

This rhetorical device is a rather effective as Americans have a tendency to view everything through their own lens of "race"/color so casting the conflict as white people oppressing non-white people because they are non-white is a powerful argument that is easily understood by Americans.

That said, personally, I think Iran is ignored more because Palestine is sucking all the air out of the room than anything else, especially with all the graphic videos/photos. Sudan on the other hand... there's really no excuse for ignoring that.