I have no idea how you draw this conclusion. Taylor Swift has an amazing connection with her fans and is a top level performer. She has no controversy in her life that would suggest she has a toxic personality or is negative by any means. Her fans absolutely love her and if you see her perform it is obvious that she loves them right back and delivers an amazing experience.
As a musician I have to admit she is an incredibly skilled musician. Her success is historic, she is one of if not the most prolific artists ever. I own none of her music and I don't really listen to pop unless I happen to catch a song that sticks with me. I will say if I catch any live video of her on You Tube she nails it, every time.
I would think most would disagree with your assessment.