Playing Racist or Sexist Characters

Here's one that just occurred to me, I am pretty much liberal in my mindset, but I see writing as a way to indulge or explore darker side of our natures, roleplaying especially. Has anyone ever done characters who may be sexist or racist in some way and if so how far did you go? Was it subtle or extreme, explain your experience of trying this and what you found from it and do you still play them?

I admit this is quite controversial a question, but really rather curious and wonder how did you manage playing them as such? Was it soul-crushing or was it little too easier than you thought it would be.

We help the multi-nationals
when they cry out protect us.
The locals scream and shout a bit,
but we don?t let that affect us.
We?re here to lend a helping hand
in case they don?t elect us.
How dare they buy our products
yet still they don?t respect us.

Billy Bragg - The Marching Song Of The Covert Battalions

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