China doesn't import nearly as much from the USA as they export to USA. There is a huge trade imbalance and this is the reason why America has escalated its trade war with China. A trade war was happening long before Trump became president China was clearly winning so Trump fired back with the easiest and most damaging thing possible, tariffs. We have heard about currency manipulation, dumping, import/export restrictions, subsidies, industrial espionage, copyright violations, and state-funded enterprises even before China was admitted into the World Trade Organization during the Clinton administration. Global trade has never been fair, it has just become more complicated. Every country is competing with each other doing what they can to get ahead. Even in socialist Europe major car manufacturers were caught lying about their emissions to pass environmental standards. Standards which were meant to safeguard European economies more than to protect the environment as their cars passed while North American cars didn't, lies!

China imports a lot of services from USA, agricultural products, aircraft, machinery, electronics, medical equipment and in general things they cannot produce on their own. Chinese imports have less elastic supply and demand than their exports; they aren't as easily substitutable. Many of these imports are protected by copyright laws or patents such as Disney films, while others are difficult to replicate such as Boeing planes and medicine. The tariffs won't be as effective on the Chinese side and will come with larger decreases in both consumer and producer surplus and result in even more inefficient markets. In any case, it isn't optimal for any economy to have tariffs but some fare better than others.