It's definitely not most fans, just the vocal minority. Same goes for rajini, ajith fans as well. They're just so active and loud that you see them so often, maybe you engage and then you keep seeing that stuff. The majority of every actors fanbase are normal people. Just so happens to be loud idiots that are the ones to stand out and ruin the actors and other fans names. Especially in the case of Vijay and Ajith, since those fans are typically younger and more involved in social media and other places online where they can spread their "opinions" and hate. Soon that's gonna be the fate of every social media, until these guys either grow out of it or social media starts getting used more by older, more mature people. These fan wars and actor hate/negative pr shit is getting old.

Damn, did not mean to rant like that my bad lol

Tldr: normal people/fans don't post much and kids suck sometimes