Gosh this is so ridiculous.
First of all, it's one of her best friends, and he is probably ok with her saying this.
Second. Would you be so p*ssed, too, if someone says that somebody is so hetero he is made for nailing women?
It's like the same just in the hetero version. And most of you would go 'Yeah, thats a man' or 'Oh my gosh, I bet he is really hot'
Just be honest and say that you don't like her because you just don't like her, and not because she said that.
So stop searching for reasons and admit it. It's no shame.