LA people and turn signals

There is a general belief that people in Los Angeles don't use their turn signals. This weekend was the first time I had driven in LA in many years, and I found that belief to be mostly true. One place where it wasn't true was on the freeway when a hot-head was tailgating someone, then passed them on the right. In one hour, I saw three cases where the hot-head used his right turn signal at the beginning of the maneuver, as if to say to the people behind him "watch out, I'm going to pass this idiot". Humorously, none of those three used their left turn signal when they cut off the too-slow driver five seconds later. Go figure.