Quentin = lack of baseball situational awareness.
Greinke = decides to take on a career .220 hitter on a team destined for the cellar of your division who outweighs you by 50 pounds. Greinke did nothing to diffuse the situation. I'm guessing his comments to Quentin were something to the effect of "thats what happens when you stand on top of the plate."
I love baseball but their inane unwritten rules are beyond stupid sometimes.