I'm not sure I would take "only" in that case too literally. There are a lot of people who genuinely do enjoy programming but get quite enough of it at work, thank you very much. In my case I do a lot of writing (words) for work and like doing it--among other things that are part of my job. That doesn't mean I spend every night working on writing the great American novel--though I do know writers at work who also do that sort of thing.

(I actually do some unrelated personal writing but not a huge amount.)

There are also people for whom coding really is just a job. It puts food on the table. They enjoy/tolerate it well enough for what it pays. But it's not something they want to do as a hobby.

ADDED: People can do whatever they want in their spare time. But, not to pick on you, the belief in many corners of tech that writing software must be some all-consuming passion is unhealthy.