Most of us repress the urge to correct others' grammar, but sometimes it's just plain fun, notably when the post of the supercilious ad hominem artist who just ripped you has a glaring solecism. (That calumny hardly ever happens on FR, of course; I was writing about
other online forums in which I participate.)
Grammar peeves? I don't know if they peeve me, but try these two:
Poor old whom is almost never used unless the construction is "To whom . . ."
Nominative pronous as the objects of prepositions: "He's not like you and I."
Makes you long for the days when every kid had to tote one of these to English class:
Speaking of misused nominative pronouns, I remember seeing a full-page Nike ad with this beginning sentence:
Andre Agassi is not like you and I. Makes me wonder if Nike could use a resident grammarian. I'd do it for only a hundred grand or so.