Saying ‘I don’t like their food’ == judgment. Saying ‘their food isn’t Thai food’ when it is == defamation. Saying ‘I found a cockroach in the food’ when you didn’t == defamation.

The issue in Thailand, is all three will get you in deep trouble if discussing the royal family, or other topics yes?

[https://www.law.cornell.edu/wex/defamation]