I don't read W/T much either (a fact I realized when I looked at my profile, saw it under favorite ships, and went, "Huh?"--when I made the list I must have been responding to canon more than I do now that it is closed). Reading fanfiction can warp one's memory, which everyone knows can be highly flawed under even the best of conditions--at least, that's true of my memory.

I can't think of my fanfic peeves off the top of my head, but I know I have them. "Childe" I personally tend to find neutral, like Chalmers, but that may be because I haven't seen it many places outside of Buffyverse fanfiction, and to me it feels the most canonical of the proposed terms for "one-who-has been-sired." (Did Anne Rice use it? I can't even remember. I know the usual etymology is to claim it entered Buffyverse fandom through Vampire: The Masquerade, whatever that is--an RPG, I think.)