"Cognitive dissonance."
The fundamental premise that the people attacking the OP cannot cope with being false is that Thai people are all wonderful, kind, gentle, peace loving people who would never do anything bad, unless the evil Falange drive them to it with their vial behavior.
When they see something that contradicts this, it would cause literal psychological damage to them to admit that it was true and their core beliefs about Thai people are wrong, so they attack it.