I think it was perfectly acceptable, yes. I wrote a paper on a topic of my choice, I handed it in, and I then posted it to my site, as a blog post.

There was nothing that prohibited this, and I had posted data (astronomical observations & images) and assignments to my site for years previous to this incident.

Frankly, I would suggest that your thinking is extremely immature, if your first course of action is to call someone else immature, and to respect all authority unquestioningly - shows a lack of development of thought, and an absence of critical thinking.