Is it right to label sexuality?

Just a thought I've had for a while: If somebody says "I'll only date black men," or "I'm only attracted to blonde women with massive breasts," it isn't (generally) acceptable - it's seen as shallow, or even discriminatory, to only be attracted to a certain group of people because of physical qualities. Should it not be the same for saying "I'm only attracted to men/women?" For example, I am male and have only ever been attracted to women, and if asked would call myself 'straight.' But I don't think that I should: I haven't met every man in the world, much less got to know them closely, and though there is no precedent, it is entirely possible that I would meet a man whom I am romantically attracted to. Surely people shouldn't make sweeping generalisations such as this without full evidence: if we remove the romantic element and say, for example: "I hate all black people," this is considered wrong, as whilst someone may have disliked every black person they've met, they can't rightfully apply that to the entirety of the group. Why should it be different for romantic attraction to a gender? Just wondering if anybody else has an opinion on the matter :)

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