In Thailand, it is extremely rude to walk around bare-chested in town. And, as is also the case in Europe, it is forbidden.
It is prohibited by law, punishable by a fine and possibly a prison sentence.
But many farangs farang
farangs "Farang" is a generic term for white Westerners, mainly used in Thailand and Laos. The word has Persian origins, coming from the word for "Franks," and has spread to refer to Western Europeans. couldn’t care less, thereby showing their contempt for the country that is hosting them.

You never see Thai people walking around town bare-chested. In fact, Thais take great care to protect themselves from the sun, even on the beach. Most of the time, they swim in the sea fully clothed.
It’s different within a family setting.
My partner’s best friend stayed with us for two days, accompanied by her son, who’s in his thirties, his partner and their baby.
Inside our home, this young man – who’s a close friend of my partner’s (she’s known him since he was a child) – didn’t hesitate to go topless. But as soon as he went out to pop to 7-Eleven, he put on a T-shirt.
I’m quite exasperated by the utterly disrespectful behaviour of these farangs farang
farangs "Farang" is a generic term for white Westerners, mainly used in Thailand and Laos. The word has Persian origins, coming from the word for "Franks," and has spread to refer to Western Europeans. who go about shirtless on their motorbikes or in shops.

These people don’t deserve Thailand!