Workin Retail sucks... yer a target for the shrinkage because yer 'management', yer a target for pinhead customers because they are pinheads, yer a target for problem employees because yer the 'man'.. gawd; I hated retail. Not many folks 'enjoy' food shopping so yer not in the loop for postive customer encounters often.. a thankless ungratifying job for me.
As for this security supercop.. he's dangerous. An overzealous twit with a hard on for yah, having been 'made a fool of' twice will probably fabricate the evidence in your next encounter.. If your name already features in his reports to his superiors yer probably already damaged goods reputation wize with the company. I'd be howling right up the management chain about this clown.. at the very least a written enounter report with your manager and a formal clairfication with your seniors regarding areas of responsibility, methods and reporting for the security clowns is in order.
Best defense is an organized focused offense. In yer shoes I'd confront the poser in the presence of the manager and file a formal grievance.. get mean. Yer reputation, if not yer phoney-baloney (pun intended) job is at stake.
Best of luck, buddy!