He couldn’t hide how much it bothered him. The boos rained down late in the first quarter of the Celtics’ blowout loss to Memphis Wednesday, the fans left early, and Paul Pierce took the sights and sounds home with him. Two days old, they were still echoing in his mind. “Nobody wants to be booed at home by the home crowd,’’ he said. “That really sat with me that night ,to be honest, and I think it sat with everybody.’’ Before they cru...