A former Macomb County sheriff’s deputy accused of slapping a teenage boy in his custody has turned down an offer to plead guilty or no contest to two misdemeanors in exchange for dismissal of a felony. Macomb prosecutors on Feb. 5 proposed Derek Reed enter pleas to willful neglect of duty and assault and battery for the August 2023 incident outside a parked patrol car while Reed was transporting the 14-year-old to the county Juvenile Justice Ce…