This may start a war, but seriously how hard is it to be a bit considerate?
My train service reserves 1 in 4 carriages as a quiet coach. The signs say please keep conversations quiet and electronic equipment silent. Not an unfair request, in my eyes.
Two blokes have just got on and are sat next to each other and are practically shouting at each other. One was on the phone, yelling down it but has kindly hung up. Do some people talk at an abnormal volume? I would imagine so but I really think they are trying just to piss people off.