spelling flame
[USENET] n. A posting ostentatiously correcting a
previous article's spelling as a way of casting scorn on the point
the article was trying to make, instead of actually responding to
that point (compare dictionary flame). Of course, people who
are more than usually slovenly spellers are prone to think
any correction is a spelling flame. It's an amusing comment
on humAn nature that spelling flames themselves often contain
spelling errors.