I know that "88" is used as a surrogate for "Heil Hitler" in neo nazi circles (H is the 8th letter of the alphabet), but "Realist" doesn't ring any bell.
I hope 81 isn't some kind of code either :)
In human-moderated systems like XBox Live I've seen some relatively 'sophisticated' offensive names get called out and banned by the moderators.
I was wondering how username-blacklist systems worked, and how they deal with names which are obviously offensive to anyone who's dealt with the likes of Stormfront et al. before, but could theoretically be chosen by a totally innocent unfortunate.
For anyone who wants examples, reading a couple of pages of http://whywasibanned.com/category/gamertag/ should give you some examples
It is interesting to think about where the line should be drawn. Especially in human moderated cases.