Cosplay is simply "role-playing", which is a popular but relatively small activity nowadays. Cosplay activities can often be seen in many comic exhibitions, online game advertisements and even some offline commercial propaganda. In Chinese mainland, the rise and development of cosplay is still a small part of subculture. And the members who like this culture are mostly 14 to 25-year-old teenagers. Their education level may span a lot, and they are addicted to animation and games. Some people even develop it into their own careers.
But for most people in society, especially their parents, or peers who have never been exposed to animation and games, cosplay is a very unacceptable thing. In these people's eyes, animation and games are simple and naive products, and they are synonymous with nothingness. People who like anime games are all children who have not grown up and have sound minds. And "role-playing" is a kind of house-playing behavior, which wastes precious time and money.
In addition, a small number of cosplay people have flaws in their own quality and behavior, and naturally these bad things will be regarded as universal events of the group. So most people in society don't accept this subculture.