Being mean is what the internet does best. I don't really know what situation she is responding to, but people are dicks on the internet.
If somebody solved world hunger and discovered a cure for cancer people would still be dickheads about them on the internet. That's just the way it goes...
It's kinda true, I mean. I don't enjoy her music, but why spend time talking about how shitty it is, when you can just listen to the bands you like? Maybe watch some Parks and Rec, maybe go to work, forget about the shitty music you don't like.