Strong public perception.
Swift is often portrayed as a front runner of liberated women and modern (however-manyth wave) feminism as well as "woke" (I really hate that word) lifestyle aka pluralistic and aware of socioeconomic issues, which certain people don't like. At the same time Swift was cited as one of the "worst" private jet owners for having taken the highest number of private flights in a certain group and timeframe (citation gravely needed). She is easy to attack due to the (supposedly) high moral standard people attribute to her image. Probably comparable to Gates in this regard.
We are. Taylor Swift and the like account for a tiny fraction of billionaire hate. Say what you mean, which apparently is "why ever criticize someone I like?"
But if you put a billionaire oil baron, a billionaire healthcare exec, a billionaire drug manufacturer, and pop star in a room - you telling me the Pop Star has the same blood on her hands as all the others?