I've lived there twice, beginning in 2001. I used to love Bangkok and it was my favorite place in the world. Now I won't step foot in it. It's become too Westernized, commercialized, overcrowded, and overpriced.
Plus, the attitudes towards Westerners seems to have gotten much worse. Customer service has gone from barely there to horribly bad attitudes. And if you bother a girl at a shop or bar who is tapping away on her phone while she's supposed to be working, good luck! Make sure there's no lose objects within her reach.
Westerners are staying away in droves from Thailand compared to 15 years ago when I first moved there.
You get what you give in this world. I've lived here in BKK for years and rarely have a bad experience with Thai people.