“Sex realist” is used to imply that gender is either not real or not important. This can also mean that gender is in some manner less real or important than sex is in all aspects of an individual’s life.
There is also an implication that trans people and the allies of trans people, or anyone who believes that trans people are who they say they are, do not believe that sex is real and call them sex-denialists.
The term itself is related to the white supremacist dog whistle “race realist” which has been used by many white supremacists to justify discrimination against non-white people, in particular Black people.
Examples
He’s male so medical consequences are not quite so catastrophic as for females on testosterone. We are very close and he knows I love him despite my being a sex realist opposed to the doctors doing him harm. I am luckier than many parents
I can only speak for myself (sex realist) but this ridiculous charade of indulging children & adults who think they’re the opposite ‘gender’ could easily be solved by everyone being honest about their gametes & presenting as they wish.
No need for ‘trans’ or fetish.
Be your sex