In some rural areas men outnumber women, and the problem of leftover men is worse than in the cities.
Tips
culture
剩男 is the counterpart of 剩女 "leftover woman"; both spread in the late 2000s. 剩女 is aimed at educated urban women and carries more stigma, while 剩男 is used most of rural men left single by a shortage of women. Both can hurt, so use them with care.