In a message posted on his Facebook page, Mr Panthongtae said the Democrats should have looked at the results of seven general elections in almost 20 year since 1995 before raising the poll-rigging allegation to avoid contesting the Feb 2 poll.
Of the seven, he said, the Democrats boycotted the one in 2006 and are boycotting next month's — and lost in all the other polls.
“The Democrats lost the elections throughout these years, even before the emergence of Pheu Thai. Losing all the way, refusing to contest the Feb 2 poll, creating a disturbance and blocking others from applying to run in the poll, people call them sore loser,” Mr Panthongtae said.
He believed the Democrats would gradually lose the support of the general public for backing the anti-government protests and the planned rally to shut down Bangkok on Jan 13, while caretaker Prime Minister Yingluck Shinawatra, his aunt, would receive more sympathy from the people.