Never.
Suns fans, especially those that go to games, aren't critical enough.
When was the last time you attended a Suns game in Phoenix? Sarver was regularly boo'ed. The only time he wasn't that I saw firsthand was Nash's ROH induction and given the atmosphere, it was fine. He wasn't cheered. Dirk got more applause than Sarver did that night.
Every other game I was at where Sarver was, he was boo'ed whenever he'd make his presence known. He stopped sitting courtside for a long time because of the jeers. They weren't Philadelphia style but it was definitely noticeable to anyone in attendance.