Clearing the Fog on "Social Norms Theory" in Jurisprudence

I have always struggled to grasp the concept of Social Norms Theory in Jurisprudence, especially during CLAT prep. Textbooks explain it with fancy definitions and jargon, but it's hard to connect the dots. Can someone please provide a real-world example or a simple definition that I can relate to? For instance, how does social norms theory relate to the recent surge in street harassment cases in India? Or, how does it apply to the changing attitudes towards LGBTQ+ rights in our country? A concrete example or a clear explanation would really help me understand this complex concept.