Lily had no idea how people interacted, so saw no basis to be polite or friendly .If someone, trying to befriend her asked;
“What’s you’re favourite song?”
She would snap;
“I never waste time listening to those stupid songs. I have better things to do!”
If someone tried to include her;
“We’re going to the Burger King after class, you want to come?”
“I would throw up smelling that cheap diluted meat.”
So attempts to befriend Lily ended as they began. She was universally ignored through school, college, and now, the work place.