The part "it's sometimes not one-sided", taken literally and minimally, tells us only that there are some people whose own actions reduce their dignity. Given a sample population of any size, this provides no additional information about the topic under discussion: there are some asinine people everywhere.

What information could the poster have been conveying, then, if not nothing? In context, I think it's clear that the intended update for readers was to raise the possibility that tomrod's indignities were self-inflicted.

It could be that the poster was trying to smear tomrod, or that they were baiting tomrod into responding at length (if so, success!), or that they genuinely didn't consider the implications of their comment, or something else entirely that was too subtle for me to catch. Probably only they will ever know. :)