Cat calling might be referred by some as something harmless, but the truth is that it objectifies women. It makes them feel as if they're being looked at in an inappropriate sexual way which could discomfort and scare many. Some even go as far as following them. Some have referred to it as also flirting but I would say it's closer to a low level of sexual harassment. Not only that but if one were to use this method to date it's not effective. If someone thinks someone is hot, sexy or whatever, just keep it to yourself, don't call them out on it. Also before cat calling someone ask yourself this, "Do I want people to cat call my sister, mom, cousin, etc, like this by others?"