I think this is to do with
Words which have multiple meanings
You could say I'm straight, or you could say I'm gay.
"Straight" can mean frank or candid, "gay" can mean happy, in which case one does not contradict the other.
You could say I'm a virgin, or you could say I've had sex.
"Virgin" can mean a person who is inexperienced in a usually specified sphere of activity (e.g, a skydiving virgin) so the statements here are not necessarily contradictory.
You could say I've always been the youngest of my family, or you could say I had a little brother.
"Little brother" may just refer to a brother who is physically smaller (not necessarily younger).
You could say I'm just as happy to date a man as a women, but you can't say I'm Bi.
Perhaps "just as happy to date a man as a woman" means you don't want to date either men or women (not necessarily suggesting asexuality but maybe you just don't like dates).
Original Answer: "Date" can mean to determine the period of time to which something belongs, so perhaps you are an archaeologist who has to work out from whence fossilised remains date.
You could say I'm queer, but not that I'm LGBT.
"Queer" can just mean strange or odd, so the statements here are not necessarily contradictory.