Actually, if it the same survey, the French were rated the worse. The Japanese were rated high by hoteliers because they are tidy, generally don't complain, and aren't cheapskates. But the not complaining may make them seem nice, but it allows some unscrupulous hotels and tour agencies to rip them off.
I heard several stories in Japan, and we encountered one such situation in Australia, but I headed it off by insisting that the different package groups be accomodated. It meant the driver had to make an extra trip of less than a hour each way to drop off some people earlier. He originally wanted to have the 1/2 day tour people wait at a shopping mall while we would have had our safari park time cut from 2 and 1/2 hours to less than an hour.
I kept insisting to him that this wasn't going to work and he finally caved in, honoring the original agreements for both groups. All the parties involved thanked me, and I thanked my wife for pointing out the situation so I could intervene (it was a Japanese tour even though the driver was non-Japanese) and correct what was an obvious attempt by the tour company to do less and still collect full prices from all the group members.