I rate thai markets by my own rating-system.
These are the important things to me.
Wide walkingpaths
No low roofs or parasols with steel pins sticking out at the height of my eyeballs.
Easy parking
Easy reachable
Big diversity
Not too hot
They have to show the prices or i don't buy at all
There are markets in every neighbourhood of every village or city in Thailand. There is always loads of food and fruit for sale.
bangkok, with those criteria, I'm really surprise you're still living in Bangkok. Or SE Asia...
I don't have to go to crappy markets, i can go where i want. We have huge supermarkets, good markets, crappy markets and many more markets.
In BKK it is a big mess on the streets but some city's in 'Thailand don't accept that so they have normal clean pavements. Actually i would like to know what happens if a tourist loses an eyeball on a market where the hight of the umbrella's is 5 feet (150cm) high. It will happen soon and sure allready has happened before.
On local markets the vendors like to make very small alleys so people have to walk slow. I hate that because my weight is double that of a Thai (90kg) and i am long and wide and don't fit in narrow alleys.
Also in our compound we have a fruitshop and the fruits are grown nextdoor. They even have a mahachanok mangotree there.
Or tor kor market is officially the best fruitmarket of Thailand or even Asia. The only bad thing there is the temperature which is really hot.
Most fruit that we eat is given to us. We don't buy much on the markets. All people who grow fruits share it with their friends/neighbours.
On the countryside you have to be carefull for fruit-trucks. They (over)load the trucks sooo high with fruit that sometimes a coconut or pineapple falls of the truck. One day my wife got a coconut on the hood and another day a bag of charcoal which blew of a truck.
Super-Overloaded Pickup Truck in Thailand