Aroldis Chapman keeps making himself extremely unlikable. On Sunday, with the Yankees holding a workout day and some news conferences at Yankee Stadium in preparation for their upcoming postseason series against the Cleveland Guardians, it was announced that Chapman would not be part of the festivities. “Chappie will not be on the postseason roster,” manager Aaron Boone stated. “He was scheduled to be here Friday as part of our workout, was not and [gave] what I thought was not an acceptable excuse. So, I’ve had him stay away for now.” Neither Boone nor general Brian Cashman would disclose wha…