Temper, yes. Cold personality, no way. Outside of a basketball setting, he was a cool guy. He was everyone's buddy at high school baseball games.
I think part of the issue was how differently he behaved around media, and how little interest he had in doing the fan-engagement stuff. If he is warm and personable around HS coaches and HS athletes, but a dick to local media with no interest in broader fan engagement, it feels completely transactional.
We have been spoiled by ultra-personable coaches like KF, Bluder, and Jensen. I am sure there is a transactional nature to their interactions as well, but they can "fake it" much better when needed. I have also seen KF talk for an hour+ at a coaches' clinic when he was just supposed to show up and wave. He also has an encyclopedic memory of names, faces, and backstories. If he is faking all of that, give the man an Oscar.