Originally Posted by
ijgordon
I'm not sure why the OP responded with "can't I just stay here longer as my flight is delayed" when he was told the lounge was closing. That's DYKWIA behavior. The answer is, "no, the lounge is closing." Of course it seems odd to escalate immediately to a threat to call police, so either something is missing from the story or the DL employee was completely out of line. But the OP asking to stay longer was inappropriate also.
How was asking inappropriate? Not inappropriate, unless he said "DYKWIA can't you keep this place open." He simply asked a reasonable question. One of the things DL touts is that they'll stay open for delayed flights. The agent had literally just let OP in and after hours.