TERF is used to describe cisgender women
Mostly used against women, but sometimes against men and even transpeople who don't subscribe to TRA ideology.
who self-identify as feminist but who are opposed to including transgender women in spaces they reserve for people who were assigned female at birth.
Replace the nonsensical "people who were assigned female at birth" with "female people" (or even just "women") and you're almost there.
This is because they believe trans women are men
As do the vast majority of humanity, especially if you're including "pre-op" transwomen.
and since men cannot coexist with their feminist ideologies
What does this even mean??? Of course men exist! Some of them are even supportive of "feminist ideologies". Is this that old "feminist = man hater" bollocks all over again?
they exclude them from their beliefs and support.
Is "them" men in general, or transwomen? My English teacher would have so many red marks on this, her pen would have run out.
In fact, they often believe they should be denied rights
Which rights? Be bloody specific!
and sometimes advocate for harm against trans people
Add "sometimes" and be vague about "harm", and this becomes unfalsifiable.