Why does the police car state that Mr. Mead lacks a profession?

Mr. Mead is only pretending to be a writer.

Being a writer is no longer considered a profession.

The police car knows that people can no longer write.

Mr. Mead is trying to be funny and have a

playful encounter with the police.

The police car states that Mr. Mead lacks a profession because he is not recognized as a legitimate writer by society. This implies that either Mr. Mead is not a successful or established writer, or that the occupation of being a writer is no longer valued or acknowledged as a profession in the society depicted.