The list places the Indians in the 3rd . It is due to the obvious reasons which include the way we carry tonnes of luggage(be it for 2days or 2yrs. of trip) , untidy table etiquettes, etc., Another surprising reason is also found. That is 'being loud'. Indians, be it in home or away, they speak loud in public .
One thing we indians should be proud of ourselves, is that, being well-developed and much civilised 'Britons are the rudest, meanest and worst' tourist and they made to top of the list.
Here are other ratings.
5th French, Norwegians, Swedes
17th Argentines, New Zealanders, Czechs, Finns
22nd Irish, Israelis