You've hit the nail on the head here. That's the thing, as much as Carrie wants to paint us all as big meanie haters or trolls, most people on here and GG used to be fans of hers.
I loved her stuff for years - bought All I Know Now and my friends and I had even debated overnight bus-ing from Scotland to London to see her in Les Mis - until I came across her thread in late 2015 and it made me realise how much her behaviour had changed and become something I didn't like. I often describe it as that 'glass shattering moment' because it did open my eyes to how much she criticised and attacked others while simultaneously attacking anything vaguely negative that might possibly about her.
I'd normalised so much of it too - to the point I used to tweet using her full name when I was like 16/17 because I knew she was more likely to see that than if you @'ed her, just from how much she searched her name.
Now I do know other creators/bands/brands/etc that do that too but nearly all of the ones I've seen use it to reply to fans/use it to promote themselves positively e.g. responding to 'what happened to x band?' or 'I miss x' with "Hey, we actually have a new album/project/etc! Hope you'll like it!" But with Carrie, it was only ever passive-aggressive likes and replies, which is not only leaves a bad taste for whoever was on the recieving end, but was
super disheartening as one of many young fans who would have thrived from just one liked tweet/comment or most basic of polite replies - yet were ignored in favour of liking a random's tweet in a convo to someone else entirely that mentioned her (by, like, initial) being a bit pitchy in one song or something equally minor just to embarrass them
It's been five years since then and I just find it wild how much I've changed and grown while she just... hasn't.