I don't mind people who use their hands "naturally" when they talk. What I dislike is when I see people who have media/presentation skills training (TV presenters/interviewers on documentaries/politicians etc) doing it in a deliberate/conscious way. There is a way they do it which differs to the way everyday conversational hand wavers do it. I imagine they go to a training session where they are schooled in how to use their hands and when to move them and it is really annoying to watch - makes them seem much less sincere to me.Well, he's always looked hyperactive, going way back before he got involved in politics. Even when he's been in films.
I dislike the whole hand waving thing, but he's certainly not the only one that does it - huge numbers of people in the media do.
I feel the same about interviewers who do the horrible manic nodding just to demonstrate that they are listening intently to what the subject is saying. It is as if it is some sort of signal designed to say "this is a serious interview which I really care about" whereas I interpret it as the interviewer feeling unable to allow the subject/their comments stand on their own without their (nodding) input. It's as if they are scared no-one will remember they were the interviewer unless we see them nodding on screen every 30 seconds or so....
It is a way of making it all about you/not the topic or person being interviewed.
I think Brand/many other hand wavers in the media are like this. Whatever he says, he always wants it all to be about him (I suspect).