I agree with your unease about anti-intellectualism being dangerous, but I'd query whether it was necessarily always what was going on when the acafen/other fen wars start up. Last time this came around, for example, I recall one self-proclaimed acafan (who turned out to be an undergraduate majoring in English literature - nothing wrong with that, but doesn't actually cut it on definitions one and two of "acafan" that you use above) telling two people each of whom had at least Master's level degrees that they were "anti-intellectual" because they were arguing against deconstruction being necessarily the one true way to approach a text. Not thinking that Barthes is the one true god doesn't make you (in the words of yet another acafan in the same kerfuffle) "someone who thinks anyone who graduated [from] high school is an academic".

The fact is, both anti-intellectualism and academic snobbery seem to be factors fuelling the tensions in fandom about meta in general and "acafan" is just one of those flashpoint words whose meaning shifts because people have already got a lot of history bound up in previous ways in which it has been used.