Those situations are when people enter the depths of true insanity.
You know the zamii incident? Where a girl was harassed on tumblr to attempting suicide through dragging every single thing she did or said online and declaring it problematic and her a toxic person, the last drop being an image of Rose from SU being drawn "too thin"?
What I heard that it started as personal drama because some girl was upset her crush was into zamii, so she decided to ruin her life and started rumours online about how problematic, toxic, racist, ableist, fatphobic etc etc zamii supposedly was. It worked, she managed to get the tumblr sjw hate machine started and actually believing this girl was horrible because she made fanart featuring minors in romantic situations or colored some characters a bit too light, at some point there were dozens of hate blogs dedicated to picking apart and hating on everything she did.
Also, take into consideration that the girlfriends of popular teen hottie singers have been getting death threats from female fans, because they feel that bitch doesn't deserve the man of their dreams and is "stealing" him from them.
or>The 15-year-old wanted to "eliminate" the girl who was also eyeing up her crush at school, a court heard.http://www.dailystar.co.uk/news/latest-news/477260/Kimmo-Lampinen-Ostrobothnia-District-Court-Finland
So, it could get really crazy. Jealousy is an intense emotion and being a teenager is an intense time. I don't think Star will go full death threat mode, but, yeah.