Online anonymity helps mask not the prejudices of others, rather our own. I know everything I need to know about XSleuth for example not based upon the color of his skin, his religious or sexual preference, or even something as awkward as his looks remind me of an old boss I had that I hated and therefore affects my judgement of him. With all that stripped away all I have are his words. And uncolored from the clutter of everything else, its more pure - I have nothing else on which to judge him.
Its a double-edged sword to be sure, but such is the nature of the beast. It can allow us to try on something new, or truly express ourselves. There's a lot of freedom in that, and almost no repercussions. Embrace it for empowerment's sake, or despise it - its your choice - just be aware its not always as negative as some might think.