Why should non-heterosexuals (for lack of a better term) have to state their sexuality? How many of you heterosexuals explicitly state that you are? Why should those of us who are not heterosexual have to do so?
If you think we should because we aren't the majority, why the flippin' hell does it matter anyway? What difference does it make to you if we aren't heterosexual?
If anything is wrong, it's people making assumptions about people's sexuality.