Authentic Thai foods are available all over the world in all kinds of different locations for the average person to be able to find. Even in the big lights and high towering casinos of Vegas, you can find authentic Thai food in some of the small family run restaurants in the area. Thai food is somewhat of an acquired taste and is something that everyone should actually try before turning his or her nose to it. Be willing to try new foods and make sure to get the authentic dish and not something that has been Americanized. The best place of course to get authentic Thai food is in Thailand, however for many that is not a realistic option.
Since that is the case, we must rely on the food that is brought to the US along with the cultures and recipes in order to get the most authentic and realistic option in Thai food.