The comment from President Gloria Arroyo's spokesman, Anthony Golez, was prompted by the seizure of Suvarnabhumi Airport by protesters.
Asked to explain his comments, Golez said "our people have reached a high degree of political maturity whereby [they] respect due process and the rule of law".
China, France, New Zealand, Singapore, Britain, the United States, Australia and Japan warned through their websites of possible danger to their citizens.
The US Embassy advised Americans to stay away from the airport given the potential for violence and civil disobedience.
"American citizens are therefore urged to avoid the areas of demonstrations, and to exercise caution if within the vicinity of any demonstrations," it said.
The airport seizure would damage investment and tourism industry, US Ambassador Eric John said yesterday.
Shutting down the airport for even one day affected a lot of visitors.
If the closure lasted for long, it would stop tourists from visiting Thailand, he said.
The US Embassy has cooperated with Thai authorities to help American visitors trapped inside the Suvarnabhumi terminal, he said.
The Chinese Embassy warned on its website that Chinese citizens planning to visit Thailand should postpone their plans; while France's foreign affairs ministry suggested that French travellers booked to fly through Bangkok make alternative arrangements.
The New Zealand foreign affairs ministry advised stranded travellers to stay with other tourists, remain close to information counters and follow instructions issued by local authorities.
Similarly, Singapore said citizens without "a pressing need to travel" should postpone their trip.
Britain's Foreign Office issued an updated travel advisory telling Britons to keep abreast of a "very uncertain" political situation.
The Japanese foreign ministry urged its nationals to be cautious. In an alert posted on the ministry's website, it said people planning to visit or to stay in Thailand were advised to check flight information well beforehand.