You mean in general or posts where you've voted already?

If the latter, you could use JS for it, because it's easily accessible in the DOM of RAT:

<span class="nnt-reputation">5</span>

You can also mark the nodes you personally downvoted in your RAT Style Settings

.nnt-line-minusminus {
    color:red;
}
[download]

Otherwise it's PM policy not to reveal the other votes before you voted yourself.

OTOH most negative posts are already listed in Worst Nodes.

So it's rather a political question...

As a practical solution, you can chose those users from Worst Nodes which annoy you the most and filter them by ID ...

EDIT: see Re: Blocking users

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