Part of the reason I suspect this whole thing is going to fade fairly rapidly is that the entire idea of the Kos kiddies excoriating FR for intemperate language fades so very quickly upon the most superficial examination of the respective sites. That doesn't address the overall topic of racial slurs, but it does bring up the uncomfortable topic of using them to sabotage your political opponents when your own hands are so very unclean.
I think a large part of the problem is that anonymity acts in opposition to accountability. That may sound odd coming from someone who posts under a pseudonym, but inasmuch as this particular one is over a decade old now even that encourages a certain restraint. For someone who posts under his own name (more or less) as you do, all I can say is more power to you.
For the posters of the stuff you just cited, all I can do is offer sympathy to you and a warning to them - that ugliness does leave scars on its perpetrators, and that that old warning Mom gave you about your face freezing up like that when you make faces at other people - it turns out to be true. Best to you.