He is one of those types of people who feel very assertive and confident in voicing opinions on subjects which they know next-to-nothing about and in which they hold no qualifications whatsoever. For example, he holds very strong views on football, Arsenal and Arsene Wenger, yet I once saw him doing that target challenge on Soccer AM and he quite literally could not kick the ball properly. He ran up to it like a toy soldier.
It could be that he has no idea who stupid he looks and sounds. However, I suspect that he is aware but just doesn't care, because he would rather be noticed and ridiculed/loathed than not noticed at all.
Not that he would ever admit it, but I'd place a healthy bet on him being one of those kids who got bullied at a posh school - constant wedgies, head dunked in toilet, demeaning nicknames - and now tries to enact a sort of revenge on those bullies by himself being a media bully. His behaviour as a newspaper editor would suggest this is the case - a kind of "Look who has the power now" kind of attitude, using all the dirty tricks because he is too much of a coward to face an opponent. Whenever he gets put in his place on Good Morning Britain, he immediately goes off and writes a Mail Online article slagging the other person off - a proper cowardly c**t's trick.
In short, the guy's a tit. What's most frustrating is that it should be so easy to take him down and shut him up, yet he only goes up against people who are piss poor at arguing and just play right into his hands every time. But I guess the smarter people just see an appearance on Good Morning Britain as beneath them, which is fair enough.