Why has debate around the tricolour become toxic?

Dublin City Council has decided not to remove Irish tricolour flags hung in some parts of the city, saying today that doing so would carry risks and be counterproductive.

But, how did we get to this place where the Irish flag is the subject of such controversy?

Former Lord Mayor and current Green Party Councillor Hazel Chu and Irish Times journalist and Historian Ronan McGreevy join Ciara Doherty to discuss.