I'd also add that I don't know anyone capable of always being unbiased. At best, it seems like we can acknowledge our biases and try to counter them, but I've never met anyone who can do so constantly.

It's like the test that Harvard put out that shows we are all at least a little prejudiced. I was a little surprised by my results, as I'm racially mixed. I didn't want to admit it was true but I spent a while pondering and, indeed, I have my prejudices.