4. Grandiose Delusions
Oh dear, jutty-out chin and a spot of domestic violence. In a two-year old we might call that a tantrum, but this behaviour carried on for a long while afterward before The Doctor managed to modify his actions into some sort of sociability. The arrogance and overly dramatic, self-absorbed stubbornness of The Doctor lurks only just below the surface in any of his incarnations, but in his sixth he instantly believed himself superior to almost anyone he ran across. You might put that down to 'the chemicals' kicking in just post-regeneration, but that's not really an explanation is it? Mental illness can be caused by physical circumstances and doesn't make it any the less real - especially for those on the receiving end. Even when put on trial by his fellow Time Lords this version of The Doctor could not take anyone seriously; no one other than himself that is. As The Valeyard so aptly put it,
"I fail to comprehend this evidence. The Doctor is on trial for his life, yet in his defense he presents us with a situation in which he is deliberately flouting accepted authority."
Precisely so. When you feel that you are so superior to anyone else then you don't need to respect any 'authority' do you?