I asked my son about this th other day. He is Thai. He just said it's for "social reasons". They are wearing masks because everyone else is wearing them, an noone dares to be the odd one out. I've seen a few Thais without masks in Central. Mainly young ones. Just about ALL foreigners are not wearing them and don't even have one in sight. It could take 3-5 years to get back to some sense of normality. Even my school refuses to follow the new MoE regulations about no need to use masks, social distancing, etc, just to please the parents (yet the kids are catching covid at home and not school!) Yet they did not require all teachers to get vaccinated to keep their jobs. The mind boggles.