Those audiences are a bunch of dickheads but yeah i will give them the right to be a dick. They come here to find some kind of honour and novelty after all. The sad thing is there is nothing wrong with hitting an opponent at his blind spot. Whether he is blind and lost 1 arm. You hit to win as long as it is according to the general rule.
Next time, a one leg man come in those idiots will yell, how dare you hit his other leg, the guy only have one leg.