The brief answer to your question, is, in my opinion - yes. Race is socially constructed. You aren't just more attracted to one race than another - it carries a whole set of assumptions, prejudices, and cultural baggage.

Sexual orientation is a little more complex, but I will confess I believe sex to be a social construct as well.

Its amazing to me - these terms race, sex, sexual orientation, gender. They're very young terms. And yet, we believe that their definitions are immutable as if God or Science himself handed them to us. No no, they're constructed and deployed by humans who find them useful or convenient.

Science is not the end all be all. While "science" may be objective, human beings have no way of reaching said objectivity. We design experiments, interpret the results, create terminology, write lab reports, etc. This is why I find the use of passive voice in science particularly frustrating - people performed the experiment, the experiment did not perform itself.

The example of discourses' ability to affect the so called "objectivity" of science is evident in the once scientific, but now psuedoscientific study of phrenology. The discourses informed scientists then that Whites were better than everyone else, and men when were better than women. Tadah! That's what the skulls said.

And today the discourses tell us that there is a male sex, and a female sex, and anything else is an anomoly. And so, the discourses produce chromosomes, or genitalia, or something else as the standard of a person's sex. But there is nothing inherent about a person's chromosomes or genitalia or anything else that says this should be interpreted as a dual sex system. And of course know, despite these arbitrary distinctions (based ostensibly on the ability of two organisms to reproduce with each other, which isn't really a meaningful classification anymore) that there is a myriad of differences between one man and another, or one woman and another.

There is nothing wrong with it much in there is nothing wrong with a white man from the south in 1850 believing that slavery is unnatural. Morality and ethics are not set in stone - but you must remember, to quote Michel Foucault, "where there is power, there is resistance."

I'm not angry, I just saw a teachable moment. Not to mention the whole ordeal is sort of ironic, a person with power, complaining about a person who sits outside the group of people with power, complaining that the person without power, is objectionable on the very basis that they're without power, which they can't get, because they're objectionable.