What do you mean the child is hopeless? What does this sentence mean when they chat with WeChat users?

It depends on the language environment in which you chat. If they are good friends, I guess they are joking. The subtext is that I can't communicate with you anymore. If you don't feel like a joking environment, such as your boss, you feel that there is no room for further improvement in your personal ability. There is no conversion value. Maybe you are stubborn, extreme in your view of things and incompatible with others. No one can change you. People will say you are hopeless.