I think it comes down to the approach taken by the communities.
The ASD community, the gay community and the disabled (or differently abled) community all recognise the fact that they are, in an important way, different from the majority of the population. Terms like "neurotypical", "straight" and "able bodied" recognise this, and the fight for equality has been one of a fight to get mainstream society to recognise that they are different but of equal worth. However, the term "cis" does not imply that "cis" people are in the majority, or that "cisgender" can in anyway form a baseline against which divergence can be measured.
In my opinion, the TRA movement is not a fight for equality and recognition. It's a fight to erase society's ability to recognise the real-world differences between the majority and the minority. As the most vocal and militant TRAs are men who believe they are women, this means erasing women. The way "cis" is used by the TRAs implies that "cis" and "trans" are not equivalent to "majority / normal" and "minority / different".
I believe that there's a major post-modernist social movement taking place, especially amongst the young, and it's being spearheaded by the TRAs, or at least the TRAs are riding the wave. Social media has created a situation where conformism is now overwhelming in a way it never has been for young people before. Rather than respond to this by ditching the technology or silencing the bullies, society has instead moved to reject the basic idea that most people are essentially the same, and it's only a few people who are quite different from the norm.
Because young people are going through so many personal changes and lack life experience, what they don't realise is that most "typical" adolescents do not feel normal. They identify with people who really are different under the mistaken belief that they really are different too. This means they champion the idea that there is no "typical". Rather than say "it's normal to feel different" they say "there is no such thing as normal". That's fine, as long as the attitude is restricted to young people and the elders help keep them protected from those who take advantage of their naiveté - but at the moment the politicians are pandering to it (possibly chasing the fictional sudden growth in youth voting).
There are several problems with this. Firstly, a lot of the TRA's arguments simply don't make sense. The most obvious is that TRAs want us to accept that trans is a separate gender, yet also want us to believe that trans and cis women are exactly the same. Secondly, it erases the protected status of women. Thirdly, it allows the terrible social pressure visited upon teens by nastier members of their cohort to go largely unchallenged. Fourthly, and in light of Cambridge Analytica, most worryingly, is that it leaves society wide open to exploitation. We really can be easily divided into large social groups, and our behaviour is largely predictable and easy to influence. Pretending that we're all unique and fully in charge of our own selves opens the door for the propagandists to manipulate politics.
I think what the TRAs have helped achieved, possibly inadvertently, is a society where it's increasingly hard to judge what is real and what is not real. This serves their own personal agenda, but it also serves the agenda of other radical or militant political movements like the Brexit ultras and Momentum / Cobynista brocialists.