He said the state government had sent a letter in his name to attend the August 29 meeting but that he had refused to go.
He further said the party made him convenor at a meeting at Mangpu and he was asked by the GJM leadership to join the talks.
"What wrong did I do? I have been threatened on Facebook for joining the talks. I felt insulted," he told a GJM meeting at Kurseong.
Ruling out any differences with the Gorkha Janamukti Morcha chief, he said, "Bimal Gurung is the undisputed leader of the Gorkhaland movement. It is since 2007 that Gurung and Roshan Giri have been fighting for Gorkhaland."
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Tamang said he had been with them for the last few years.
"Bimal Gurung is like my elder brother. Don't listen to those who are against the Gorkhaland movement," Tamang told the meeting.
Chief Minister Mamata Banerjee had described the August 29 meeting held at the state secretariat as "positive and cordial" and had said the dialogue process will continue to restore peace and normalcy.