Terfness isn't spread by terfs, each one is the result of a woman either directly abused by people like this or who have witnessed others ripped to shreds, called names anyone else would have their teeth knocked out for, or even facing deaths threats.
I was for trans rights when I was transmasc, until people like this mocked me for being abused by a tw and I noticed how common it is for even "queer" women to be thrown under the bus in the name of centering men.
Every "terf" (MOST not even radical feminists!) is the result of a light bulb moment like that. No one looks at the vitriol being sent to us and thinks that's a fun way to go about life, be reasonable.