"Tea and biscuits with the Chief Pilot are in order and next time stay in what you know..."
Sorry, but no.
Not to correct this before the doors were opened was unforgivable and any line manager should take formal action against this pi**ock.
This guy needs to understand his basic responsibilities and only a formal process would deliver this. I don't advocate sacking but he should have no doubt about his stupidity.
I wonder how many flight crew on this forum would defend a SLF or security operative who thought they would have a bit of fun with an operating crew and did not correct it before the target person/people were affected? No, thought so.
GH