In my former life as a professional touring audio engineer one of my accounts was the Jackson Family Show, (Jackson 5)Since none of us knew Michael Jackson personally, none of us are qualified to make statements pro or con regarding his personality.
my nickname among the sound folks at that time was the 6th Jackson.
In my experience with the entire family, they were all extremely polite, well behaved, educated, completely grounded for the level of entertainment achieved.
GeorgeBoards