YTA, but not because you shared your preference. i feel similarly about hair. it is a make or break attraction point for me. i am not attracted to men with short hair. my husband knows this. he had gone from chin length to a buzz twice, and i asked him not to again, and emphasized that i love his hair long, he has beautiful hair, but it's his hair, attached to him. yeah, i missed his hair when he buzzed it, but hair grows back. there's a whole rest of a person there. he keeps very long hair now because he knows how much i love it.

what she heard was "if i cut my hair too short, he won't be attracted to me." the natural question is, what else would kill my partner's attraction to me? if it takes that little, what else is there? that's what makes YTA. she needs to know your attraction to her goes deeper than that.