The way I see it, there is two possibilities.
One: Hikaru is correct, and you indeed plagiarized the majority or entirety of the post and have attempted to use a combination of psychology, sociology, and partially irrelevant historical examples to fool us into thinking that you did not. The proof backing this is that Hikaru is indeed correct, and your level of literacy that has been seen across the board thus far makes even my nine year old neighbor seem like a novelist. This is something that I agree with Hikaru on wholeheartedly, and even you must admit that there is an absolutely massive difference.
Two: You, Night_grue, are correct, and you simply did not put in the kind of effort that is even near the minimum expectation of this board while posting IC. The massive variance in your post qualities present us, as teachers, a very large problem that will most likely take all of us together to rectify, and even then, will still depend on you actually bothering to put forth the requisite effort. This isn't a casual RP site, where you can get away with half-assed posts that are exceedingly difficult to make sense of.
Hikaru does have proof of her argument in the form of the previous posts that you have made on this board. The huge gap in quality raises a valid argument, in my own personal opinion, and I do question the validity of your placement posts. I understand that you two have a rather, unfriendly, past and honestly, I find that fact irrelevant. She is a teacher, who acknowledges her faults in her field and has/is attempting to improve.
On the other hand, none of us can tell whether your argument is true or not. There is no evidence showing that the posts are indeed your work, and that your posting in the In Character sections of the board were simply lazy.
Judging solely from the contrast between this topic, and the other posts you have written on this board, you have massive potential. The problem is, you do not seem to care. Rather than using the abilities you have to the fullest, you instead half-ass it and hardly put forth any sort of effort. It is because of this that I foresee you being a very difficult student to teach because of your lack of drive.
Also, saying how convoluted an argument would be when you are asked to submit proof that the writing is indeed your own, and not ripped from some other source on the internet, is useless. It will not stop us from continuing to ask you for proof. If anything, it will simply annoy us, thus making us less likely to attempt to teach you.