I don't think many visitor would like dirty & disorganised Bangkok on their first visit, especially if you are used to clean & orderly Singapore. However you will find that people are generally friendlier than in Singapore & Malaysia, both of which are generally known to be the least friendly in SE Asia.

If you spend enough time in Bangkok you would appreciate that despite the madness, things do work relatively well over there infavour of the man on the street and you dont need to fly Air Asia if you dont want to. This is in contrast to KL where cost of living is artificially inflated to please the egos of evil dictators or to enrich the pockets of a few businessmen connected to the ruling party.