The only thing that betters society is the positive application of knowledge to creating something of value for others. It's not enough to learn a topic, you must actually apply it make a difference.
We're talking about institutional education, not gaining more information. So in this discussion we're not talking about people spending their money to become more informed on Kardashians. We're talking about them going to school. As far as I'm aware, there's no school that teaches the history of the Kardashians.
At any rate, I believe the poster you responded to was using hyperbole to equate "history of the Kardashians" with some degree that he or she deems "equally as useless."
Instead of the usual "basket weaving" as an example of a useless field of study, he used "history of the Kardashians."
> The only thing that betters society is the positive application of knowledge
To apply knowledge, you have to first acquire it. How do you propose to do so without education?
Eventually we'll look back at college (including trades) education being free like we look now on elementary education being free.
Education conveys benefits besides merely financial: a technician might receive no financial benefit from knowing about DNA, nuclear fission and distance to Mars. However, these people make life choices informed by their general knowledge, they vote on policy, they act when Covid-19 is in the news.
If we take your perspective far enough, we will have a society of idiot savants that are clueless outside if their narrow speciality.