> He obviously meant "is choosing to spend your time reading morally superior", though
Sure. I'm answering it by another measure. Killing is, ceteris paribus, morally inferior to not killing. I'd argue a psychopath is henceforth morally debilitated despite it not really being their "fault" that they're born without empathy. This, in turn, helps me conclude that a murderer is, in fact, doing wrong.
Same here. Someone who can't read isn't inherently less morally capable than someone who can. What reading gives one is the capacity to gain a better understanding of ethics and morals. So I'd guess folks who read books are, on average, more intelligent and at least seeking to conduct themselves in a more moral fashion than someone who doesn't. But that doesn't make spending time reading morally superior to some other activity.
That reading gives the capacity to gain a better understanding, doesn't mean that all readers use it that way. The act of reading itself doesn't make the people more willing to be more understanding. Someone who cannot read could have the same desire for understanding and might choose to engage that desire by talking to people in person. The fact that the latter doesn't read, doesn't make him less morally superior.
The only correlation that reading and intelligence have is that intelligent people find it easier to read, and therefore enjoy reading more, and therefore read more. It's not the other way around.
I hate these discussions on HN. Unless we first agree on what 'good' and 'bad' are, this question is basically nonsense. In any case, what you choose to do on your own in your free time has basically no moral or ethical impact whatsoever.