Guys I want the honest truth. How come most guys aren't into taller women?

My best friend wants to know since she is a larger girl. She has never been asked to dances or asked out on a date. She is 5'11. She asked this guy out but he said she isn't his type. She has been stood up so many times. Most people are intimidated by her. I'll be honest I was scared of her at first because of her size but we're good now. Anyways guys be honest. My friend wants to know.