Wrong! As in any nationality - some of them are - for instance, look at some of the cases you read about where the Thais do awful things to their children.Or the cases where Thais team up to beat the s**t out of some foreigner for some slight demeanour. Or the myriads of cases where "ladyboys" assault and steal from foreigners in the "family friendly resort" which seeems to be anything but.
Personally, I have never come across any of these "horrible, evil, disgusting awful people", but as the posts in AN and other media show - they do exist!