I don't think it is necessarily wrong to assume that, but I do try to avoid that assumption myself. I have been guilty of making it a few times, as well. It is important to remember that it is better to get to know others by their personalities, ideas, philosophies, and quirks rather than by their sexuality, though. It is somewhat insulting to define a person entirely by their sexuality, as in reality, that makes for only a fraction of who they are as a whole. Think of it this way: I would feel tremendously insulted if all anyone ever saw about me was that I was a heterosexual. They would say: "I met this one hetero guy in class today, I don't remember his name, but damn, he was really hetero."
See? it can diminish people to one single personality trait rather than seeing them as they are: a collection of ideas, philosophies and traits, often conflicting with our preconceptions and assumptions. Heterosexuals tend to assume heterosexuality, and while it remains the most common orientation, the reason we assume it may just be a certain comfort with ourselves and our sexuality. Homosexuality tends to be more complex, as coming out of the closet risks backlash from friends and even family members, and cuts the number of potential partners down rather dramatically. As such, sexuality and orientation tends to be closer to the conscious mind of homosexuals. Whereas heterosexuals tend to forget or become complacent.
None of this implies that the op did anything wrong. As I said, I have done this before on occasion. It is just that I try to not assume any kind of orientation out of consideration for others.
See? it can diminish people to one single personality trait rather than seeing them as they are: a collection of ideas, philosophies and traits, often conflicting with our preconceptions and assumptions. Heterosexuals tend to assume heterosexuality, and while it remains the most common orientation, the reason we assume it may just be a certain comfort with ourselves and our sexuality. Homosexuality tends to be more complex, as coming out of the closet risks backlash from friends and even family members, and cuts the number of potential partners down rather dramatically. As such, sexuality and orientation tends to be closer to the conscious mind of homosexuals. Whereas heterosexuals tend to forget or become complacent.
None of this implies that the op did anything wrong. As I said, I have done this before on occasion. It is just that I try to not assume any kind of orientation out of consideration for others.