I've got to say that having been a secretary for a long time, I really hate bad grammar. And the worst thing is the misuse of apostrophes (apostrophes are the things that hang in the air, commas are the ones that lurk around the bottom). It's really a personal thing - I hate it when I see the possessive use of apostrophes (forum's) used for describing multiples (forums).
I do not judge people on their bad grammar, I just "tsk" in my head - and I never feel the need to correct anyone or point out their mistakes. My trade, for what it's worth, is a typist, so I cannot pull anyone up who does not type on a daily basis at around 80wpm. I don't know the ins and outs of these people's lives, they could be very severely dyslexic for all I know.
However, recently, there have been a few threads opened recently which I haven't been able to answer because I haven't been able to make head nor tail of them...