You didn't write this, but he quotes around it. We know that he knows that you didn't write this. He quotes the text he paraphrases. So what follows is now his understanding of you.
I want to draw attention to one part of the text. He uses a lower-case "i" rather than an upper-case "I". This means that in his understanding he feels two things about you: 1. You are less than a full human. 2. You are too stupid to spell correctly. Both of these things are contradicted by your own writing. It is clearly visible that you tend to spell things correctly and that you have a sense of self. No one reasonable would contest these things. Which means John isn't being reasonable.
Is it any wonder then that in his next word, he laughs at his caricature of you? No amount of intellect on your part will be capable of persuading him. You are not an intellect to him. You are a thing to laugh at. He already distorts your points in order to allow himself the liberty of attacking his fantasy of your idiocy. Perchance lets say you make the wisest point possible. Something so beautiful that God himself would weep for the brilliance of it. All just men who see it would smile. Ballrooms of people who heard it would stand and clap. We have a good idea of how it is that John would respond to such insight. He would quote his version of you. Then he would laugh at the "it".