As someone who has lived in Thailand, I get why Thais were pissed. The hotel, the taxi, the public transport all look like they're from 30 years ago. Yes, you do still find run-down buildings and tuk-tuks in Bangkok today, but it's generally a lot more developed and modern than westerners expect on first arrival. Instead of showing the reality, the creators of this ad went out of their way to portray an outdated caricature.

To an outsider it might seem like nitpicking, but Thais are fed up with being presented this way to an international audience.