Yeah, I observe myself doing something similar.

In my own case it started out as a kind of a political stance -- roughly speaking, as a way of treating straight people as actually having a sexual orientation, rather than as the unmarked case -- and turned into a habit of thought without my quite meaning for it to.

In my case I'm fairly certain that I don't discard the information... that is, I'm fairly certain that if you did an IAT on me around gender and sexuality you'd find I expect opposite-sex attraction much more than I expect same-sex attraction... but rather that I've trained myself to behave, as you say, in ways that don't depend on it.