grammar was one of my highest scoring subjects in elementary school. that was 10+ years ago. today, society is blaming the internet for the decline in individuals' grammar skills. consequently, there will be folks who are anal about grammar, so as not to succumb to the horrible mistakes of others.
i do believe that my grammar skills have since declined, but i have yet to place blame on the internet for it. it may also have something to do with the fact that i have not read a real book in ages (but that's also due to the fact that i spend more time reading content on the internet than in print).
i have no problem with folks who are sticklers about grammar, since we can all learn from one another, and people who post for the public are opening their words up for criticism -- whether it be content-related, spelling-related, or grammar-related. therefore, one should not complain if someone tells him that his grammar is incorrect.