This comment I think is implying that all biases are evolutionarily encoded, which I am certain is false. Many biases are formed by your absorption of the actions and words of the people you grow up around.

The point isn't "biases shouldn't exist." The point is, "not all biases are accurate or useful," and "some biases can be actively harmful to either yourself or others."

I used to work with chemicals frequently. Humans have a bias towards treating clear, odorless fluids as being safe. That is a deeply dangerous bias in a biochemistry lab. You've got to be aware of it and act to counteract it. In my experience, that's all anyone is asking for: that we recognize where our biases might be harmful and try to limit that harm.

Of course most biases is something we learn. Some of them can certainly be harmful if we are out of our ordinary environment, like in your example. Or if bias is based on a false assumption. Evolution simply roots out those individuals who are unable to build proper biases :)