[QUOTE=Mangofan;1145941]I have lived in BKK for 4 years and have always been too afraid to go to Saphan Kwai because of the language barrier. I probably know 100 Thai words / phrases (horrible, I know). What would happen if I walked into one of these places without knowing much Thai? Would I be ignored and / or refused service?[/QUOTE]
I don't think that you would be ignored, but you probably won't have much fun. In some Thai places, there might be a few girls who can speak as much English as you can speak Thai (or slightly more at best), but it's very likely the less attractive and older ones. If you cannot communicate with the girls, don't expect much in the room afterwards (for instance, a BBBJ is not granted by default with those providers, unlike with most of the girls working in the tourist-oriented places who are used to service foreigners).