The question asks why the audience's student loans should be repaid now when hers were not. The response is that the reason is the same as paying for her son's prison sentence for raping a minor, which is "betterment of society". Let's count the number of ways this fails:

• "For the betterment of society" is a justification that could be used for pretty much any defensible policy decision. It really doesn't further the argument at all unless there is something specified about how paying student loans makes society better.
• RAPING A MINOR is in caps both to indicate shoutiness and to emphasize this aspect of the crime, which again, is hard to tie back to an argument about student loans
• The main failure - the fact that it's a blatant ad hominem directed at the poster for having a son who raped a minor, which is an evidently successful attempt to hide the weakness of the purported argument by casting the OP as someone whom one would not want to be associated with by virtue of being a parent to a rapist. This implied argument, which is the real argument, is invalid in the absence of evidence that rapist-parents cannot have valid opinions.
• It's also a particularly egregious example of an ad hominem because it relies on guilt/worthiness by blood relation, the same concept behind ideas like racism and even worse, inheritance.

Better answers might include:

• Education costs have risen to a degree that the fairness calculation is now different
• Student loan debt is a threat to the whole economy and just as bailing out banks sometimes makes sense, bailing out student loan holders might as well
• Financial inequality is out of control and we should dispense with antiquated notions of "fairness" to the wealthy when circumstances have been more fair to them overall than at any time in the past

But these answers would not get reposted on social media as much because they don't play into tribalism and social drama.