To be honest I thought it was referring to real-life bullies that use cyber-bullying as well on their victim; harassing them both IRL and with text messages/emails/etc. That's what I always hear about, anyway. I don't think it's just talking about internet trolls.

if it is though that's kinda lol. "SOMEONE I DONT KNOW WAS MEAN TO BE ON THE INTERNET WAAAAAAAAA"