Alliance MLA Anna Lo has said she feels deeply insulted by Conall McDevitt's comment last week that she “doesn’t understand the importance of diversity”.
Mr McDevitt made the remark after Ms Lo criticised plans for roadsigns in English, Irish and Ulster Scots.
“I was awarded an MBE in recognition for my work to promote good relations and diversity, and for him to say this is staggering,” said Ms Lo.
“I know that political debate can be robust, but I don't think anyone should insult someone in the personal way that he has. I believe that he should apologise for this remark.
“He has totally missed the point we made regarding these particular plans and how they could actually damage community relations, because with the way the proposed system will work there can unfortunately not be both Irish and Ulster Scots together on any sign.”