Just sounds like you got an officer having a bad day.
Ever have to do deal with lost luggage officals at an airport ? Now there is someone who really hates their job can you imagine all they deal with is people in bad moods
Traveler "My luggage didn't arrive with me"
Offical "Has your plane landed yet?"
Traveler "No, I'm having an out of body experience"
You have to be remote working for self or others and or take soft power education courses like culture language or cooking ... martial arts or medical treatments.
DTV is just simply a glorified educational visa that last 5 years unlimited entry 180 days stay
Can you upgrade to DTV from ED visa I will be in thailand for 2 years for study, can i upgrade it in thailand or do i still have to be out of the country for that