My guess is that it's a reference to the SWERFs and TERFs (sex worker exclusionary radical feminists and trans-exclusionary radical feminists). I should note that those names are considered insulting by those within the movements.
Many feminists say that gender is entirely a social construct and trans women are reifying the gender binary, adopting only the patriarchy approved aspects of what it means to be a woman, "performing" femininity. They say that a woman is not what exists as the notion of a woman in a man's head. It's controversial, to say the least.
Sex work makes for a pretty massive division within feminism. While some argue it's a woman's choice, others say that the very nature of the work itself is exploitative (full disclosure, I'm rather sympathetic to that notion, myself). The idea is that prostitution and porn are symptoms of patriarchal control of female sexuality, that there should always be female bodies available for men's sexual amusement and that men, not women, decide how those bodies look and what they do, and so define female sexuality and create standards for what is permissible female sexual expression.
These are both pretty interesting ares of study and there's a lot of information available online about them, though you're going to have to cut through a LOT of really angry rhetoric to get to the heart of the matter.