going back to when the fighters get sent from the ring, you can often sense when it will happen, with a fighter doing bad, a chorus of boos will start to sound. Often though you will get a round of applause at the same time, with one lot of gamblers that have bet on the under performing boxing letting it known they are not happy and the ones that are backing the fighter doing well applauding. You will often hear a bit of a chant too 'Pair laew ho' which is aimmed at the complainers and basically translates as 'just because your losing' lol
It can be very tough for the boxers sometimes, when they could have a totally legit reason to not fight to their usual standards, but the crowd are very quick to point the finger at wrong doing