There was a spate in the midlands I believe where new recruits to the local gangs had to go through an initiation process to egt in. It would involve driving around with no lights on at night and waiting for the first person to flash you to you let you know they are not on. You then chase them and shoot them! 
I don’t know how true this is but its stopped me letting people know!
I don’t bother when I am driving and see some driver with faulty lights because when I do and shout them on the CB to tell them “Driver, your trailer lights are not working” I get the usual response…
“[zb] off back to Australia and keep your nose out”, to which I respond
“Hope you get a ticket [zb]”
I should point out that it’s usually either a container hauler or a garbage hauler that has this attitude.
Best just keep my mouth shut and let them get some points.