I had a post removed today for using the word "spook" in reference to government agents, a common usage that I see around the site, because it is a racial slur, although ive never seen it used with that intent (not that it matters), and it only gets removed maybe 10% of the time. In order to be consistent and not offend any comrades I would propose adding it to the word filter so its removal will be uniform and not open to mod interpretation.
Glowie is absolutely a racist term, it came from the guy that made his own operating system (Terry Davids and temple OS I think) and he used it with racial intent. The original term involved the n word as far as I remember.
As for spook, I've never heard of it being used as a slur.