Its football though, it comes with the territory and as I have said on here before, there are a huge hunk of people that are a bit more blasé with how they throw about some words and don't actually mean them with as much vitriol as they are intended. Its just sounding off after being wound up for so long.
Also, he really hasn't had anywhere near the level of abuse that some managers get but he has brought all of it on himself through his own blind arrogance.