It's actually not silly, but okay. Cat-calling, in certain situations, and to certain degrees, can be completely harmless. Many people, and women in general, do acknowledge that. But when you experience it your entire life and when it is quite obviously of a sexual nature, and it is done to the sex who is constantly regarded by many people as weak and vulnerable, who are considered sexual objects, it's not "silly" anymore. No one should be cat called if in the wrong situation, and especially not just walking down the street minding your own business. Doesn't matter if you're male or female, but it is quite obviously different--in our society--with men and women. And if you cannot see the difference, then you are perpetuating the belief that there is absolutely nothing wrong with the situation. If you wouldn't want or like it happening to your mother, your sister, your daughter, your friend, your girlfriend, your wife, then the same must apply to strangers.