Ryona is one of my biggest kinks and I'm basically a full on SJW IRL, anon. People can and often do have kinks that are purely fantasy and nothing more. How many women have rape fantasies but still, of course, would be rightly horrified at the concept IRL.
Likewise, just because you hate women IRL doesn't mean you necessarily find the concept of them being harmed sexually arousing. Despite what bad fanfiction writers will often tell you, hatred and love aren't two sides of the same coin.
Relax. Enjoy the kink, or don't, but don't judge people for what is harmless fantasy. If you really are concerned about violence against women, worry about the people who are actually engaging in or advocating for it, rather than those who say 'hey, in a purely fantasy context, this is kinda hot?'