Hmmm... people rarely say they hate each other to their faces unless they're 14 year olds speaking to their parents.
Either you've been a real tit and you deserve it, or ........ there's something else going on. If you know what I mean

My ex used to say she hated me all the time. What she actually meant was she hated the fact that
1 : She found me attractive.
2 : I was almost always right.
And immediately after saying she hated me would give me a hug, or whatever else.
That kind of hate is quite exciting actually and leads to good sex.
I would venture that women find it frustrating when they find a man attractive, because they can't control it. What they're actually saying is they hate the fact that they like you.
If this bird you're talking about seemed genuinely upset, then sounds like you did something really stupid.
If on the other hand she said it in a more adolescent toys out of the pram kind of way, I've got my money on that she likes you and hates that for some reason. She doesn't want to like you but does.
I think you're gonna have to face the music and tell us what it was you actually did. Also describe the way which she said it.