I think there are many objective reasons. Many times it may be deliberately hacked. Some people will send some ugly photos of her, and then let everyone mourn her together. Others will cut down some videos they recorded and then vilify her with some eye-catching bad titles. So many fans don't know the truth, or don't understand, just talk about her. They say that good things don't go out, and bad things spread thousands of miles. Now that the network is so developed, it won't be long before these things will be known by many people, and many people will scold her. In fact, she is also very helpless.
Sometimes she makes a little mistake or loses a little temper, so many people will exaggerate this behavior and make a mountain out of a molehill. Many people will follow suit without knowing the truth, which is very bad. As a fan who likes her, we should protect her. No matter how others vilify her, we should not follow suit and treat some things correctly. There are many reasons for bad reviews, and she can't be blamed personally.
Rational idolization, don't comment on her casually without knowing the situation, and don't use cyber violence against others. If you really like her, you will like everything she does, and no one will tell you not to like it.