First time I encountered someone rolling coal was when I was driving next to one in my Miata. I didn’t really know what was going on and thought he had an engin

First time I encountered someone rolling coal was when I was driving next to one in my Miata. I didn’t really know what was going on and thought he had an engine problem or something. I made sure to stay away from him since I was in a Miata with the roof down and didn’t want to breathe the fumes. But the guy in the truck seemed to try and stay close to me. I thought I was probably imagining things. But I later came across a post somewhere that people who roll coal sometimes target specific cars (like Miatas). Not sure why.