Prince William and Kate Middleton faced anti-monarch protesters outside Westminster Abbey

Protesters held signs reading "Not My King" and shouted at Prince William

A video of the incident was posted on TikTok and went viral

The demonstration was reportedly organized by a group called Republic

Public aims to abolish the monarchy and replace it with an elected head of state

This is not the first time members of the royal family have faced protests from Republic

King Charles III and Queen Consort Camilla also ignored "Not My King" signs from Republic during a previous royal engagement

The incident has sparked debate about the future of the monarchy in the UK

The monarchy remains a divisive issue in British politics and society