Wouldn't you be pissed as hell if your center won't snap you the ball when you are yelling at him that the clock is about to expire (TWICE)? Or when your RT gets a false start on a critical 3rd down? Coaches do the exact same thing and nobody calls them crybabies. Rivers is basically a coach on this team - he is the unquestioned leader and is quick to hold people accountable. I like that. I have seen Favre do the same thing on many, many occasions too - talking smack to other teams, visibly upset at plays/players. Regarding Manning, in addition to all of his antics, he will also never apologize when it is his mistake. He always blames someone else. Those plays last night that went wrong were not Rivers' fault. On top of that, all the Chargers players love him and were basically all in support of Rivers taking over the team instead of LT (who actually is a crybaby) - that tells me that they respect his passion for the game.
I can obviously understand that my homerism makes me see this differently - but I love Rivers. He is a tough, throwback QB and a damn good one. The guy loves the game and plays it well.