Good for Carlos. Generally, guys should charge the mound more. And throw some punches when they get out there instead of all the pathetic wrestling and pushing and shoving they usually do. The threat of a beating is a far bigger deterrent than a suspension with the money these guys make. At least we'd then know who's really ready to stand firm behind the "unwritten rules".
And, yes, I'm aware that maybe in this instance Greinke wasn't throwing at him. If that's the case, given the history between those two he may have considered being a little conciliatory and letting CQ know it was unintentional. At some point enough is enough...