I know that it's not me who the person is insulting, it's instead the person's perception of me.

Where do you apply this knowledge?

Over here, my perception is that you somehow disagree with most of the field of education. (If that's false, you can probably think of a way to show us.) And of course, even if I knew who you were, it would be ridiculous for me to believe you over most other experts just because you have "knowledge of the subject" in the same way that many others do.

You could write a different comment, excoriating Less Wrong for trusting single experts who appear to disagree with a field's majority position, and I would find it about as convincing as the linked criticism.