Here's one:
http://purecssmenu.com/

Maybe the problem is that there are two action attributes in your form tag.

in my opinion a lot of coders think of this of a great resource. If you can show you can achieve the same with your concept, you may get more recognition. You state that it is about html, and not...

I think it doesn't make a difference when compared to div's. If he wants to make his point, a good test would be to recreate a 'css zen garden' page. I'm sure it's possible and it would help him...