This fetish is perceived to be very weird because balloons are associated with children and, accordingly, people who literally love balloons can be treated as pedophiles (Nikolaj Rantala). Foot fetish is one of a kind of fetish where people are attracted by some body parts (Ryohey Sasagawa). This fetish is treated as abnormality because people rarely pay attention to feet when it comes to romantic relationships or attractions. They are more likely to seek people with certain color or hair or eyes. The Love Dolls video by National Geographic deals with one more abnormal sexual behavior where men almost fall in love with human-like love dolls. Men give names to their dolls, take care of them and treat them like people.
All these fetishes look strange to me because they really challenge traditional understanding of sexuality. I grew up in a traditional family with totally conventional beliefs about sex and relationships. Balloon and love dolls fetishes look really strange because I simply cannot understand why people feel sexually aroused by things like dolls or balloons. Overall, perception of sexual abnormalities heavily depends on the person who judges what is normal and what is