So much so, in fact, that he's driven clubhouse favorites like 3B Kevin Youkilis out of town. He's also put himself at odds with the front office by calling this month's Sox squad "the weakest September roster in history" (source: Boston.com), incited multiple spats with stalwart 2B Dustin Pedroia and threatened to punch WEEI's Glenn Ordway "right in the mouth."
There's been more than enough evidence of conceited behavior from Valentine to dub him arrogant.
He's a big reason why Boston has collapsed like an undercooked flan this season. His attitude and managerial approach has been divisive, off-putting and ill-suited to a mercurial Red Sox clubhouse.
But for all his quirks, Valentine is just another in a long line of arrogant Red Sox. Throughout their century-long history, Boston has been plagued (and blessed) by egotistical employees.
Let's take a look at five pompous Sox whose tradition Valentine has carried on admirably through 2012.