Just to deal with the first one @MargaritaPie - I cannot believe that you can think that's credible.
For example - as a woman I am a very low risk for becoming a sex offender but I am also of the class 'adult'. If I want to volunteer to hear children read at a school I need to be criminal records checked. Because some adults abuse children. Adults are a class and a tiny minority abuse kids. JKR is no more "Insinuating that trans women are by default a threat:" than expecting adults to be checked by schools is insinuating that adults are by 'default' a threat. They are not on whole but we know that the dangerous need excluding - hence the law. It is daft to argue otherwise. The example is as you must see, daft.
The other examples are similarly daft.
You do know that to banging in a quote without explanation is somewhere around a grade D (in old money) for GCSE Eng Lit - to actually pass with a C you need to make an opening statement that bears some resemblance to the evidence you are giving and then extend your point by picking out the words, phrases, rhetorical techniques, etc that further prove your point. Develope an argument based in evidence.
What the poster on twitter is doing is making random whining statements and then without reference to the random 'evidence' quoting JKR without comment sensible or otherwise. In fact if there if you don't really make a link between statement and evidence you'd be struggling to get a D - I was being kind to you.
so no evidence, zip, nothing, zilch...
And if you're about to say you got an A* in Eng Lit then use your close reading skills properly instead of chanting your catchecism. Seriously, consider yourself embarrassed in front of your classmates and slink off back to your seat and do your homework again.