I doubt narcissistic personality disorder. But like most people he has a fairly large blind spot for understanding what living around him means. As an example, he lived in a basement apartment and ended up getting two of his neighbors burned out He knew his presence had made it a combat zone. And yet his little apartment was a greater imperative then his neighbors safety. As if shoveling the snow made up for that.
Which might be part of what makes a wizard, a wizard, most live solitary lives for a reason. A bit of arrogance goes with the territory if you can wield that kind of power. An old actor named Walter Brennan played a character in a television western, one of his repeated lines was, "it ain't bragging if it is fact." That kind of how it is with wizards.
Getting back to why most wizards live solitary lives, it is dangerous to be around them. At least in the world Harry lives in, and yes you could say he didn't perhaps appreciate the danger him living in he beloved basement apartment put others in. However he had to live somewhere, and until the caper in Hades where he acquired a sock full of diamonds, as the saying goes, Harry was mostly "so poor he didn't have a pot to piss in let alone a window to throw it out of." He lived in a place he could afford, most likely not giving any thought to the safety of those who lived around him. But then again, back in Dead Beat when a troupe of zombies danced though his place, or the the frog demon back in Storm Front, or the numerous times he had been shot at or beat up on his door step, no one in the building lobbied for him to be evicted either. Intimidated? Maybe.. Or was Harry a decent neighbor and it was a tough neighborhood?
Well, I think he has always being somewhat of a bully, because he has intimidated several vanilla people. Cops, Marcone people (Varsity), I am sure there are other examples I am too sleepy to remember now. But he has also resisted bullies and protected the helpless. So it's not so easy or black & white.
I disagree about Marcone, he isn't the kind of guy that can be bullied, nor those who work for him, he does the bullying if anything or his people do. Harry did play tough against him, but that is what Marcone respects. I also think he was mostly respectful to cops if they are respectful to him. I totally agree that it is more grey than black and white.