He was trying WAY too hard. I'm not sure what he was trying to prove, exactly, - that he was a "proper lad," maybe? But I didn't buy into the act at all. He seemed to be really overcompensating for something.
It was a bit of a shame because I think he'd be rather sweet without that nonsense. During the quieter moments he came across as pretty mellow and he clearly loves music, so it's sad he feels he has to act the way he does.