Most small towns where remote workers might settle are not driven by agriculture. Agriculture matters, but we don't live in an economy where everything outside of metro areas is just farms as far as the eye can see.
In the past you could certainly say that urban areas give back just as much or even more, when factories where concentrated in cities. Today the factories are not only in the cities.
The country side can be self sufficient, the city can never be. Thousands of trucks deliver excess goods from the country side to the city every day. Saying that it is the city that supports the country side is fancy accounting.
Where on earth did you get this impression? I have lived in both small rural towns and large cities, and this is hogwash.