Germaine Greer is not on my list of positive feminists. In Fact, I dislike most of her speeches and most of her views. Why? She is a TERF. Trans-Exclusionary Radical Feminist - a loosely-organized collective with a message of hate and exclusion against transgender women in particular, and transgender people as a whole. They have attached themselves to radical feminism as a means to attempt to deny trans women basic access to health care, women's groups, restroom facilities, and anywhere that may be considered women's space.
My article about TERFism can be read here