It means fans, plural. In other words, more than one. I am proud of you for condemning it and for having never done it. What do you want, a medal? I’m pretty sure your condemnation of the act has never included you stepping up and telling them to stop.
Until your dirtbag fans quit doing it, it will continue to represent how classless a portion of your fanbase is. The size of that portion of your fanbase is up for debate.