I guess the idea is, to prevent (or at least discourage) the usual types of harassment up-front, and deal with the more unusual, rare forms on-the-fly as they appear.
Yet, there is specific point about "reverse-sexism" and "reverse -ism" not being considered a problem.
The concerns are valid, the text is written with an agenda in mind and the agenda makes people weary.
Those are the motives of somebody who believes that no policing at all is better than half-ass policing.
We already have organizations that deal with illegal activities. We pay them for it and we give them a monopoly on violence, so why not use them instead of trying to replicate what they do, partially and poorly?
So if you are subjected to an unusual type of harassment, you're on your own?