I think the only thing a non-C-level can do is get another C-level person to take action. Present a well-thought-out and well-documented case, and see if they will take action.

This may sound risky. But:

1. If you succeed, you may dramatically improve your working environment.

2. If you fail in a way that damages your job, you probably should have been looking for a way out of there anyway, because he's going to continue to make that a crummy place to work.

Note well: You probably shouldn't try this until you're ready to leave, both emotionally and financially, because you may get fired on the spot.