First, report every instance, no matter what. Did you know that as a private citizen, you are allowed to make an arrest for a non-bailable (an offence that a person cannot be released on bail for, as a matter of right) and cognizable offence (an offence that a police officer can make an arrest for without a warrant) that happens in front of you? USE IT!
Second, educate people around you. Schools must have their children sensitized and educated, and taught gender equality. There are many organizations that do this – there’s my own (The Red Elephant Foundation) and Schools of Equality, that go from school to school to teach children, parents and teachers alike. We need to ensure that we shift the mindsets that prop these ideas up.