Certainly if you hit Thai history with a big enough hammer, you can shrink it down to a paragraph. That said, you really went off the rails at the end on the politics. It isn't a rich/poor split, it is a Central (Thai) Thai vs ethnic Laos/Khmer. Poor people nearer to Bangkok mostly support the traditional power structures. In the north and east regions that only have a few hundred years of being part of the country, they support the corrupt populists.
If you see the movie "The King and I," (any version) the character of the young prince, in real life he grew up and banished slavery and the old system of numerical social status. It used to be that everybody had an assigned numerical value that they wore pinned to their shirt. It was like that for a long time, generations, and most of the working class were valueless (literal) slaves. It was changed simply by decree; not in response to a social movement or unrest or anything, simply because the King was well educated and told people another way of doing things. So they don't have the same history that most of the world has, of people struggling for rights and freedoms. Rights and freedoms have generally been thrust on them unrequested. And so they do not really have functioning politics.