Most cats are very sensitive to sudden loud noises which may not be good around children or the owner. They making less affectionate and unfriendly to the humans. Singapura, Sphynx, Scottish fold, Siamese, Korat, Egyptian Mau, Cymric, Bombay, Bengal, American Wirehair. This breed was need the assistance of animal behaviorists and veterinarians. And this list of cats arent necessarily unfriendly, less friendly than most other cats.