It's not a 'different system' it is a lack of common sense, consideration for other road users and a firm belief that what they do is right and everyone else is wrong. I have not really seen anyone coming to an intersection blasting their horns aggressively, either Thai or Foreigner. Roundabouts are a problem not because they are too polite but because of the ones who charge into the roundabout thinking everyone else must stop for them. There is zero understanding of right of way by Thai drivers, either at T-junctions, cross roads or any other form of intersection. They simply keep pushing until others have to allow them out. Basically Thia's throw out the highway code when they get behind the wheel and do what they have seen others doing while they grew up. Driving standards here have not improved in the 40 years I have been driving here, because there is no real enforcement of the traffic laws. Trying to assimilate Thai driving habits will get you pulled over in short notice back in the real world. There is no 'technique' to learn, what you need to do is simply drive defensively and expect them to do the unexpected because they generally will.