'TERF' is just another version of 'manhater'. Which feminists have been getting called since forever.
'TERF' is slightly more cunning though because the average right on lefty liberal is horrified at the idea that they aren't open minded and inclusive of everybody and everything. They will throw girls and women under the bus in order to fall over themselves to declare the Emperor's nakedness a marvelous set of trendy progressive post-modernist clothes.
Transactivism is very powerful and making a lot of ground because it appeals to both left-wing men and right-wing men and it is a movement by and for men.
Left-wing men get to congratulate themselves on how PC their misogyny is and right-wing men prefer gender bolstering transsexuals to gender nonconforming lesbians and gays. Neither has bothered to notice that transgenderism is a hijacking and appropriation of transsexualism.
Of course both the left wing misogynist and the right wing misogynist would think that you were insane if you suggested that they marry and have a family with a transwoman (even though both swear that transwomen are female). And transactivists are narcissistic enough to fall for all this - they mistake misogyny for true acceptance and support of their delusion.