I think you could fall in love with anyone if you saw the parts of them that no one else gets to see. I don't know, like if you followed them around invisibly for a day and you saw them crying in their bed at night or singing to themselves as they make a sandwich or even just walking along the street and even if they were really weird and had no friends at school, I think after seeing them at their most vulnerable you wouldn't be able to help falling in love with them.