Not incredibly certain, but it could also be the opposite.

For instance, it could be pointing out the stupidity of those who call something outside of the binary a mental disorder. I'm not much of a linguist myself, but surely there'd be no point in using only 'I's.

Then again, if you looked at their post history to find those other two, maybe they put zero thought into this as well. Or maybe those two examples weren't from the same user. This looks oddly cut and unexplained, so it's not like it makes a difference in the end as to the fact that it is a low quality post.