BBC Monitoring has translated some snippets from Thai language press op-eds/editorials on the red slanguage protests. Key excerpts:

Papers disagree on whether or not the decision to splash blood on Prime Minister Abhisit Vejjajiva’s house was wise, but most agree that the reds’ protest, backed mainly by rural Thais, has made political gains.

Lom Salatan in THAI RAT

City people don’t seem to understand why a large number of rural people have agreed to leave their hometown for a political rally in Bangkok. The city people seem to forget that these demonstrators voted for their favourite candidates only to see their representatives kicked out by a coup in 2006… These demonstrators have thus clearly seen that the country is undemocratic and that a double standard exists.

Praphat Pintoptaeng in KRUNGTHEP THURAKIT

The red-shirted movement has been painted as a scary movement for middle-class people in Bangkok… but the mass rally of red-shirts has managed to significantly change their perception… The red shirts should recognize an important success. They have managed to restore their public image of a peaceful political movement, and they should try to maintain it.
…
Editorial in MATICHON

If the red-shirts give up and return home, it won’t mean that their movement will disappear… The war between the social classes, which has been incited systematically with the networks of the red-shirted people, will go on.

BP: Strangely enough, as you will see, it is mainly the English language press in Thailand who are more negative towards the red shirts than the Thai language press.