The level of vitriol he directed at latin players, especially in the early-mid 2000s is what I remember most---even more than his crummy book in which he made up narratives, and tried to settle petty vendettas against the players he disliked.
I qualify this by stating it is only my opinion, but the way he wrote about Latin players---Offerman, Pedro, Ramirez etc....there was a particular focus on the amount of money they made---flashy cars, clothes, jewelry, contracts. He seemed to equate poor performance with their acquisition of material goods---Offerman was not exactly popular with fans, but the constant harping on flashy personalities and wealth seemed rooted in some deep seated resentment that he took personally.
I'm sure that he is a great family man, but he does not seem to be a nice guy---I try not to form a judgment based on personal anecdotes--you never know the specific situation etc.
But I've heard so many about him----from colleagues, fans, production people on TV shows--none of them are positive. Arrogant, and petty. Even emails he gets that are pretty mild he responds with annoyance, disdain and hurls insults. Many stories of him chasing after people who offended him, contacting their employers to complain--I never liked his reporting or his columns---he tried to weave himself into ever story he wrote, and portray himself as the voice of Boston fans everywhere.