AP has an item about how elderly Gazans remember Israel fondly, while young ones who have never been there and never worked with Israelis have only hate. [I can't say why Haaretz chose to publish this piece from AP - after all, even interns at Haaretz know more about the subject than AP].
The article, predictably, mostly blames Israel, nothing to get worked up about. The reason I'm linking is because the phenomenon is true and important, even if the explanation is wrong. Prior to the First Intifada, between 1967-1987, Palestinians roamed freely throughout Israel, and large numbers of them worked in Israel. It wasn't an idyll, indeed, those 20 years set the stage for the next generation of violence, but at the time most Israelis and most Palestinians personally knew people from the other side. In Jerusalem this is still true, but in many other places on both sides it no longer is. The First Intifada began a process of mutual disengagement, and the so-called Peace Process dramatically accelerated it. Had it succeeded in creating two peaceful states alongside one another, it might not have mattered. The reality, however, has been that Israelis and Palestinians are physically separating, and the result is ever less familiarity, which enables ever more demonization. Talk about unintended consequences.