What is he says goodnight but still online?

When someone says goodnight but is still online, it means that they have signed off from a messaging platform or social media platform on one device but are still active on another device. This could be due to forgetting to log out or simply switching to a different device. It is important to respect the person's privacy and not assume that they are deliberately avoiding you. It is also important to note that just because someone is online does not mean they are free to chat or that they are obligated to respond immediately.