A married couple landed behind bars in Florida Wednesday for allegedly stopping a mom from disciplining her misbehaving child — who’d just spit in her face. The mom told cops that the fracas in a Davie parking lot started when she got into a heated argument with her 4-year-old son, who spat at her after she reprimanded him for acting up, as reported by Local 10 WPLG .  The mom smacked her kid in the mouth and the torso in an attempt to keep the brat in line.  Terry Williams, 66, and his gray-haired wife Mary, 63, witnessed the tussle between the two and raced over to intervene.  Mary Williams, 63, and Terry Williams, 66, were arrested pouncing on a mom who was disciplining her child, Local 10 WPLG reported. Terry began to criticize the mother for how she disciplined her kid, claiming that he worked for the Florida Department of Children and Families and that she couldn’t yell or hit her kid.…