The problem with this, as with many other debates, is that it becomes polarised when it's not a simple black and white issue. There are many nuances which could be discussed in a rational manner, but when it comes to social media, Twitter in particular but not exclusively, it becomes 'us and them' and broad brush terms and insults get thrown around.Sure, but it's largely an accurate description of an ideology. It's not a personal attack, it's a description of a viewpoint.
Calling someone a white supremacist isn't an insult if they espouse ideology that the white race is superior. Calling someone a creationist is not an insult if they believe in biblical creation.
Calling someone a TERF is not an insult if they espouse trans exclusion.
"Trans exclusionary" is one such term. One person might want trans people to be treated the same as their birth sex for all purposes; another might feel they should be treated as the sex they see themselves for all but a few well-defined and entirely logical cases. Both are lumped together as "trans exclusionary". This stifles debate, because once you label someone like this, the tendency is to dismiss everything they say without actually examining it.