Modi made the remarks at an election rally here. (Agencies)
He added that the two Tamil parties were not bothered about people's welfare.
Karunanidhi told reporters that Modi's comments were enough to earn the "Tamil people's displeasure".
Modi also told the rally that people should vote for the six-party alliance that includes the BJP in Tamil Nadu in the Lok Sabha election.
Queried about Modi's meeting with actor Rajnikanth and the latter's comments that the Gujarat chief minister was an able administrator, the DMK chief said: "No comments."
Modi made the remarks at an election rally here.