He states in more than one interview that he's not comfortable with all the attention people are giving him because he never know why people staring at him. Beside from this I would say most of the time he is acting weird after he recognized he's been filming or whatever - it's like an natural reaction of him: Unwanted attention = physical defensive reaction. The hoodie, cap, hands, sunglasses etc covering most of his body is a clear sign for protecting himself at least in my eyes. He is acting like a victim (in more than one way). Maybe because he is who knows. If he's a victim - what I'm afraid he is (maybe not in the worst possible way but still) - you can't expect a 'normal' behaviour. Just saying