There is no doubt he's gonna get boo'd like crazy instead of cheered.
And I don't blame them. He didn't want to play for the city of Cleveland any more, and there are many questions about his attitude in the months leading up to his public trade request.
He didn't leave them high and dry like someone leaving via free agency, because it's clear when teams like Cleveland (in 2010), OKC, Utah, etc. lose players like LeBron, Durant, Hayward for nothing in return, it really hurts the future of the franchise.