She is calling no one a bitch. It must feel fantastic to twist other people’s use of words to mean something completely different from what they actually said. She said that she does not respond to people who are Trans Exclusionary Radical Feminists. Equating the term TERF with any generally derogatory word, but especially one so incendiary and vulgar seems to say more about you than it does Cassie. She is talking about a small group of people (comprised of men and women) who hold a specific ideology. She is not using this term to insult anyone; she is using it as an explanation for not responding, because she recognizes that people with this ideology will take whatever she says out of context, twist it, and weaponize it. Kind of like you have done here.