When we see a man kissing another man, the preconceived associations in the hidden brain tell most Americans that this is not what men do. Of course, we can quickly shush our hidden brain and act blasé. But when we are juggling many things, when we are under pressure, or when we are simply busy doing something else, it becomes difficult to suppress the automatic associations of the hidden brain. At such times, the hidden brain’s rapid conclusions about the world become especially powerful. If we are asked to make a judgment about these men in some other context—their job performance, for example—we may get the feeling they are not quite right for the job without knowing how we leaped to that conclusion.

When I say “we” have automatic biases about gay people, I really do mean everyone—straight people and gay people. Just as black children tend to have positive associations with white faces rather than black faces, gay people can unconsciously harbor the same associations as straight people. This should not be cause for surprise: Gays usually see many more straight families than gay families in real life, on TV, and in books. If the hidden brain learns through repetition, why would the unconscious associations of gay people be much different from the unconscious associations of straight people?
(Shankar Vedantam, The Hidden Brain: How Our Unconscious Minds Elect Presidents, Control Markets, Wage Wars, and Save Our Lives, p. 74)

We have a long, long way to go.