TOKYO — The Ugly Americans terrorized Europeans and Asians with their booming voices and tennis shoes in the years after World War II. Decades later, Japanese tour groups descended from their air-conditioned buses to flash peace signs as they shot photos of every known landmark as well as laundry on backyard clotheslines.

Now it is China’s turn to face the brunt of complaints. The grievances are familiar — they gawk, they shove, they eschew local cuisine, and last year, 83 million mainland Chinese spent $102 billion abroad — overtaking Americans and Germans — making them the world’s biggest tourism spenders, according to the United Nations World Tourism Organization.

Their numbers have also placed them among the most resented tourists. Mainland Chinese tourists, often laden with cash and unfamiliar with foreign ways, are tumbling out of tour buses with apparently little appetite for hotel breakfast buffets and no concept of lining up.

The frustrations with the new tourists were summed up on a Thai online message board last spring, when users posted complaints about Chinese tourists using outdoor voices inside and spitting in public, among other transgressions.