I don't think you can rope in South Asia in this, these are one off incidents that can't spoil the name for the entire country.
Of course the Bangladeshi stadium crowd which gets complaints now and then, thats not a good sign. You can't do this in the stadiums and especially not the players, voice as much anger you want in the newspapers, blogs or in your drawing rooms.
I personally was impressed with the Sri Lankan crowd. The match fixing allegations only sully this a bit, but the crowd was fantastic. SL is losing and they kept drumming like business as usual and just having a good time. So South Asia can't be blamed.