She ALWAYS AGREES! One thing that's driving me nuts?

So there's this girl I've known for a couple years now and there is one thing that unequivocally drives me nuts, in a negative way. Every time I say I like something, or have an opinion on something, she ALWAYS AGREES! There are times where I KNOW she doesn't like something or doesn't have the same viewpoint on something (through something she said or did in the past that I remembered) and she will contradict herself just to agree or say she also likes/dislikes it.

Why would somebody do this? It's insulting when I know she likes something and says she doesn't just because I said I hated it.
She ALWAYS AGREES! One thing that's driving me nuts?
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