Hate to break it to the noobs, but Ballmer has ALWAYS been an asshole, I mean like from the first day. He probably punched his mama in the face once he was out. That's why Gates put him in charge, mistaking sheer arrogance (which he had) as managerial ability (which he absolutely did not have).
He's been a brutal bastard for as long as he's been in business, and had the authors talked to anyone that worked at Microsoft in the 90s they'd have known it. Instead, they write the entire article as though this is just recently happening, which is odd as fuck. It makes me wonder who they are trying to convince, and why.
It's hard to blame acquired wealth when a motherfucker never had an ethic beyond bullying and "fuck you I got mine" anyway.