Said trans person already misuses “triggered”, and acts as if it’s a choice, despite, as a trans person, to have likely experienced real triggering. No one chooses to feel gender dysphoria (or whatever other mental anguish is being triggered).
The writer is strawmanning actual positions in the same way that anti-trans media likes to do. The argument is not that “transgendered” is transphobic. It is that the term implies that something has been done to them, like other -ed words. They say it’s like calling a black person “blacked.”
The argument for trans woman and trans man is that trans women and trans men are really men and really women, not something else that needs a new word. It’s not that the lack of space is transphobic.
However, what happens when a minority has preferred terms is that those who oppose them will intentionally use older, non-preferred terms to get under their skin. (For example, “Democrat Party.”) And that is why the usage starts to come across as transphobic. Someone who doesn’t know isn’t being transphobic, but when someone is knowingly using the wrong terms.
The post contains a lot of ridicule of trans positions, but doesn’t actually propose any counterargument. It picks a single incident where it turned out a situation was more complicated than it seems (turns out woman who didn’t want room with a trans woman had been raped by one), and uses that to attack “the trans community,” ignoring the fact that the poster supposedly is a part of that community.
It also contains a lot of fairly uncontroversial opinions in the trans community, but presents them as being different from what trans people belief. Such includes saying she doesn’t think trans women should participate in sports or that trans children should not be given drugs to help them transition before they are of age.
Then there’s arguing that, because one trans person laughed at some jokes, they can’t possibly be transphobic. Or an irrelevant argument about whether or not it was misleading to list trans people under a tweet about trans murders if they weren’t murdered for being trans. (When your message is about the trans community, you can’t use evidence that had nothing to do with them.) I could go on, but I’ll stop before I wind summarizing the entire article.
Point is, you could remove the claim that they are trans, and the entire post doesn’t change. Their trans status is being played as a card, as if being trans suddenly makes the same bad arguments more credible.
Bad arguments are bad arguments, no matter who makes them.