Not so much on the internet, but I hate it in the real world when you see somebody who has a really prestigious position or they're a secretary or something and they have piss poor grammar or can't spell. I think to myself, "How the hell did you become my boss?" It bothers me even more, nowadays, when I meet a student who has nothing but A+ grades in school and gets a college scholarship and they have trouble with simple grammar. It boggles my mind!