Goodreads, like any social network, attracts a lot of perpetually-online people involved in activism, the sort where it is acceptable and even encouraged to shout down authors whom one’s community regards as detrimental to society. No need to read the book first, because judgment has already been cast. Therefore, those users can’t be expected to feel ashamed for their behavior, rather their behaviour might even serve as a form of social currency with their in-group.