The governor also called for having inner line permit system to check illegal migrants in the state.
Interacting with senior journalists based in the state, Acharya said Tharoor's comment has hurt the sentiments of not only the people of Nagaland but the entire north eastern region.
"The entire region is, as the rest of the country, proud of its rich culture and traditions. Diversity should be respected," he said.
Such a statement is "extremely regrettable and unacceptable," Acharya said adding that Tharoor must apologise to the people of Nagaland in particular and the nation in general.
"I ask you why does our prime minister wear all sorts of outlandish headgear wherever he goes around the country or around the world? Why does he always refuse to wear a Muslim skull cap?" Tharoor had said while speaking at a seminar in the capital of Kerala on August 5.
On the publication of National Register of Citizens (NRC) in Assam, Acharya said Nagaland should have a strong system set up to check possible influx of illegal migrants in the interest of the people of the State.
"We should also have a strong Inner Line Permit system," he said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)