The worst I've seen is tourists on Bangkok Air. No masks when they were still mandated (maybe they still are?). And their arrogant attitudes were horrible. Like I was the enemy for wearing mine.
I live on Koh Samui, but had to come to Bangkok to take care of some things.
Two friends of mine caught Covid on a flight a few weeks ago. He's had four shots and was very ill.
Can we agree that masks are not needed in uncrowded areas outside, but when we're all in a metal tube, breathing the same air, it's time to put one on?