There has been widespread political condemnation after a sign was placed on an anti-internment bonfire in Newry, Co Down taunting the family of an IRA victim.
The placard referred to the murder of the father of the victim's campaigner, Willie Frazer.
Bertie Frazer, a part time UDR soldier, was killed in an IRA gun attack in Co Armagh in 1975.
Willie Frazer said: "This shows the mentality of these mindless, uneducated, entrenched individuals.
"These people are unwilling to move forward, their only aim is to provoke and spread their hate-filled agenda."
Mr Frazer added: "I am well used to this type of mindless bigotry, as are the families of the victims we represent, daily we take abuse, be it over the phone or in the street.
"These people have no history, no culture, nothing to be proud of, so they cling on to the glorification of murder. It's more to be pitied."
Minister for Foreign Affairs Simon Coveney said it was "disgusting and should be condemned."
Sinn Féin MP for Newry and Armagh Mickey Brady said such actions were hate crimes and had absolutely nothing whatsoever to do with republicanism or the legacy of internment.
He added: "It is anti-republican, and does not celebrate any aspect of Irish national identity or cultural traditions.
"Throughout the North, Sinn Féin has been working with communities to provide positive alternatives to bonfires and the number of them has been greatly reduced as a result.
"The kind of mindless, hate-filled displays on the Newry bonfire are further evidence of the need to continue that work."
SDLP Northern Asembly member Justin McNulty said those responsible should be ashamed.
"In 2018 there can be no tolerance for such hate in our society.
"The SDLP's message is clear, these actions do not reflect the true meaning of what it means to be an Irish republican, and I hope they are widely condemned."
A Church of Ireland bishop said he was deeply saddened by the sign.
Bishop of Down and Dromore Harold Miller said: "It was personalised, shocking and inhumane.
"I know it does not represent the ordinary people of Newry, whom I have experienced as warm, kind, and keen to move in a direction of reconciliation and peace.
"It is important to say that such dehumanising and demeaning messages conveying hate and causing hurt are not acceptable from any part of our society, and I want to add my voice to those who utterly condemn them."