I can’t speak for others, so this is only my reason for taking his site in this specific point:
There is a single case that the whole point is based on. From my school days I’m still trained to act in these kinds of situations, as in my native country the worst event in history happened, and one factor was the hate on Jews that was fueled by generalization and history. And at least my teachers made sure that me and my schoolmates would go against any generalization we become aware of.
Regarding my argument about JasonAfex knowing or not knowing Kabiers age at the time, I am 100% positive he knew when they begun dating, I just say that (looking at the circumstances) much of their relationship could have developed before he knew her age.
Of the Friends I mentioned in the explanation why I have a problem with being called “bro”, there are 3 I do not know their actual age. Though I know they're adults, as 3 do have full-time jobs that require 2 years of professional training (after finishing school) and one is in her professional training after she stopped studying half-way through.
[Edit:] Asking because I wonder: Why do you call him proud about dating a 16-year-old (once)? He didn’t deny that, but (in the given FA-journal’s comments) the first talking about it was gunstinger. This doesn’t fit my understanding of being proud. To me it reads more like he’s annoyed to repeat something he had said/wrote many times before, though that is how I read what he had written.