Earlier in the day, referring to Raja's remarks, reported in a section of the media, Vishal, head of the Tamil Film Producers Council (TFPC) and general secretary of the South Indian Artistes' Association (SIAA), had also demanded an apology from him.
However, Raja clarified that he had only watched clips of the movie on his mobile phone and said he did not have the patience to sit through a two-and-a-half hour film.
The actor also said he wondered "how a political leader like you could watch a pirated version of a film (online)" and added that it "sets a bad example".
This was "totally insensitive and uncalled for," said Vishal, who is known for his strong anti-piracy stand and activities.
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Demanding an apology from Raja on the matter, Vishal also pressed the government to enact more stringent anti-piracy laws.
Raja, however, categorically denied having watched the movie, especially online as it was being made out. "I had not watched the movie. I only watched the clips received on my phone," he told PTI.
The availability of pirated CDs and DVDs of new films is also an issue.
Actor Vijay's fans have been reportedly circulating the contentious scenes, allegedly mocking the central government's Goods and Services Tax (GST), through mobile phones.
"I don't have the patience to watch a two-and-a-half hour movie. This entire episode shows that whoever opposes the BJP are supporting Vijay, and this is expected," Raja said.
Diwali release "Mersal" has kicked up a row with the BJP taking exception to references on GST in the movie.
However, Congress vice president Rahul Gandhi, his senior colleague P Chidambaram, DMK working president M K Stalin, veteran star Kamal Haasan and a host of Tamil cinema industry representatives had supported the film crew on the issue.
In Puducherry, Chief Minister V Narayanasamy came to the defence of the film, saying questions have been "justifiably" raised on the GST and the Digital India initiatives in the movie and there could be no objection to expression of one's views in a democratic set up.
"Will those unable to tolerate criticisms made by actor Vijay in the movie against the GST seek action against me as well for objecting to the abnormal levy of taxes at the council meeting?" the Chief Minister asked.
Stating that movies, television and newspapers had every right to express views and criticise policies and decisions of authorities, he claimed that there was no political motive, whatsoever, in the movie's dialogues.
The BJP had on October 20 objected to what it termed as "untruths" regarding the GST in just-released "Mersal", and wanted dialogues on the central taxation to be deleted.