Key word here is "legitimately". While there is indication that the LEO was legitimately following up on a complaint, there is no indication that the citizen had reason to believe the LEO had either a warrant or probable cause to request ID.
In fact, the LEO was acting like a smart-a$$ with a badge and the citizen had no reason to believe it was any more than that.
Some years ago (at least 15, maybe more like 25) a case came up where the local cops in one of the "island cities" in the DFW metromess were pulling blacks over and asking for ID and reason for being there. The case made it to the Supreme Court and the cops were told they needed "probable cause" and being black in a ritzy white neighborhood wasn't sufficient.
Do you work for Mr. H? The video shows very clearly that Mr. H. was informed of the reason by the cop.