from watching a number of his shows on both bbc and american tv, i'd have to say that while the foul language seems just to be his normal speach, the nasty attitude is a schtick. it's a total put-on for tv. much worse, or really more sensational for american tv.
he's a big, fit guy so he's able to intimidate a lot of people and plays that up for his shows. he is a bit full of himself.
i've seen him curse in front of his 4 kids on one of his shows, so that seems to be normal for him, but he also seems to be a good and loving dad.
the only thing i don't like about him is he says yeah or yes to solicit a response too often. it's annoying in the way someone says "you know", "umm", or "right now" far too much.
A true lover of nature does not despair now that his mistress has turned a colder cheek.