We don't know that (in bold) any more than we know that he was a malcontented prick. Both are obviously assumptions based on pieces of information available. Maybe he was trying to make the most of it and doing everything right. Maybe he was being a dick and was causing problems.
I don't think he's boo'd for "no reason". Right or wrong, he had a beef with a coach that is very popular with fans. Right or wrong, he's been going after Necas, a very popular player. Right or wrong, a lot of outlets have indicated it was more than his on-ice play that got him traded. How much a person wants to believe those outlets is up to them, but there's ample reasons IMO for fans to boo him.
I don't hold ill will towards him, but I don't fault fans for booing him either. He seems to be loving it as well and it's probably helping his standing both on his team, giving him motivation, and helping in future contract negotiations, so sounds like a win-win.