It's not cool to be exuberant, unless you're an MFY: Eric Chavez stared into the visitor�s dugout from first base as each devastating dagger cleared the left field fence. It was bad enough the A�s were delivering what Chavez, at that moment, assumed was a devastating Yankees loss. But after each of three 13th-inning homers that turned 5-5 to an 9-5 Oakland advantage, Chavez said, most of those on the A�s bench participated in what he described as �an orchestrated clapping, chanting� celebration that he had a great view of from first � a view that made him angrier and angrier with each long ball. Chavez told The Post he considered the acts �high school-ish� and �pretty unprofessional.� �I thought it was distasteful,� Chavez said. �That�s not cool. That�s not how you play the game. I am all for having fun, but that crossed the line. It is all about being humble.� http://www.nypost.com/p/sports/yankees/oakland_antics_irk_chavez_IOkxlcZu2HVfwCE2f2lloN