Its their system, just sit back and laugh at how terrible it is.

if you're not born in thailand and you live in thailand you are a farang ,no matter what status of visa you've got

Comic Surfer - with a comment like the following from one of your posts, "Uneducated, illiterate Thai immigration officers that are not Native Speakers of English don't qualify as reputable." certainly gives me a good idea on what you should be called.