Back-end developers are responsible for creating the “server” part in web applications, in other words, they deal with everything that relates to the software and administrative part of the web application, the internal content of the system, server technologies – databases, architecture, software logic.
There are a lot of backend jokes on the Internet, they just can't be seen.
If backend developer doesn't understand you, try to start from the back end.
How to make a backend developer hate you? Just ask him to fix a bit the layout.