You got he last one wrong.
Q: why were we soured and negatively responding to Peja?
A: because he was built up to be far greater than he was, given the golden boy treatment, set up as the anti-Webber (somehow being one of the better players in history was bad) and annointed as the second coming. It was ridiculous, and either partisan or ignorant depending on the source. The first stage was that people who questioned the hype quickly grew sick of the stupidity on the topic, the shrill claims, the demonization of the rest of the team to benefit a good but not great player. Resistance grew and the negativity toward the shrillness surrounding him began to be reflected on Peja himself, who was still the same guy as before. Stage two was when it became apparent to the rest of the fanbase that Peja was not close to the hype that others, not he, had generated about himself. Peja himself buckled under the weight of unrealistic expectations and wanted to escape. And the fanbase turned on him bitterly in disappointment. They had been promised the golden boy, perfection in sneakers, and they got a softish one dimensional shooter. Ironically many of the people who had cut through the hype earlier were less disappointed in him in the end.