Well, the NFL, NBA and NHL are full of guys with the same kind of attitude you describe. And ... on the personal level ... plenty of guys in the MLB Hall of Fame were unbearable and intolerable in their personal lives.
In my opinion, an experienced manager and effective leader of young men should have been able to correct the problem. And ... being an obnoxious and self-centered loudmouth doesn't compare to the felonious conduct of, say, a Lueke or a Bush ... or even the MUCH more potentially serious problems presented by, say, a Hamilton!
And ... if the Marlins were willing to accept the Neanderthal behavior of, say, a Guillen, well, the Ruggiano you describe is just kid stuff by comparison!
Miami is historically a place where generating celebrity, exercising out-sized egos, demonstrating flash and bragadoccio at every turn, and living large are de riguer. Even if Ruggiano is as ego-centered as you describe ... he should find plenty of acceptance in Miami. (And, in the end, he and Stanton may well become the new "Butch and Sundance" in the sports scene there ... and the acknowledged movers and shakers of the Marlins' offense and, in fact, they may well end up being the prime energy driving the franchise over the near future!)