As an expat, I can assure that if one ignores such offences then the situation aggravates with time and even an offence like catcalling (which some people might think is insignificant but is NOT) could lead eventually to even worse crimes so “Nip the evil in the bud!” Just for an experiment: Try for yourself being a woman for few days and if you get catcalled, I am assertive you would taste the fear, despair, and anger that women feel. I respect the other gender and since we are all equal, I expect the same from all of them (I say ‘All’ because I agree majority of the men are respectful)
Källa: