Maybe he does know that specific law. Often times when there is a person that has to deal with idiots such as you are showing yourself to be, they learn the germane laws so they know who they can file a complaint on.
Other than that, say he doesn't know the law. That doesn't mean he can't call the police and attempt to file a complaint. He doesn't have to know the law. If he thinks the law has been violated, he can call the police and make a report.
Not seeing LAPD dealing with this, they will put a cop to catch violator but nothing more for infraction. Now if this was NYPD ye I would almost for sure get a ticket.