If you want to know what Chinese tend to do wrong (both at home and abroad), this list published by China Daily gives you the picture:

What to do
The following are the rules of etiquette for Chinese citizens traveling abroad as issued by Chinese government:
1. Keep the environment clean. Wrap up your chewing gum before you discard it. Don’t spit on the floor. Don’t litter. Don’t smoke except in designated areas.
2. Observe public order. Don’t yell or shout. While in a line, stay in your line. Don’t talk loudly in public places.
3. Preserve the environment. Stay off public lawns and refrain from picking flowers or fruits. Leave the animals alone and don’t feed them.
4. Protect historical sites and cultural relics. Don’t carve or scrawl on them. Don’t touch or climb on the relics and heed the restrictions when taking photos around them.
5. Be careful with the use of public facilities. Don’t smear or break objects in hotel rooms. Don’t vandalize or damage public facilities. Don’t attempt to make off with public belongings. Conserve water and electricity by using them efficiently. Don’t waste food.
6. Be respectful to the people around you. Don’t try to snap photos with foreigners without their permission. Don’t sneeze into the face of others. Don’t occupy public facilities for too long. Respect the work of service staff. Respect the local religious customs.
7. Be courteous to others. Dress appropriately and don’t go bare-chested or naked while in public areas. Be considerate toward the elderly, people who are ill or disabled. Follow the rule: “Ladies first”. Never use vulgar language.
8. Take part in healthy entertainment. Stay away from pornography, gambling and drugs.

The list came with an article published 1 August 2013: “Chinese tourists told to polish up on etiquette”:
http://www.chinadaily.com.cn/cndy/2013-08/01/content_16859651.htm

More than 1.55 million Chinese students study overseas and the number of Chinese outbound tourists was nearly 83.2 million in 2012.
A poll conducted by US-based e-commerce site Living Social in 2012 found Chinese to be the second-worst tourists in the world, second only to the US respondents themselves.
“It’s embarrassing to see warnings against littering, spitting on the ground or smoking in non-smoking areas only in Chinese characters at some places of interests abroad,” said a tour guide from from a travel agency based in Shanghai.
“In addition to the quality and lack of moral restraint of some Chinese tourists, travel agencies and improper hype by the media also contribute to the obnoxious image of Chinese tourists abroad”.
Never mind what they do in China, right?!