I try my best to be grammatically correct, I am intelligent enough to know it, couldn't be bothered to apply myself at school and have therefore suffered since in life as a result, so I think I'm good at writting words in senternces but not perfect all ways!!
I like to pull people up on their poor spelling/grammar as a petty pleasure, sometimes I make a prick of myself, I once pulled someone up for putting - White Heart Lane on Facebook, I 'corrected' it - Harte, and my other mate corrected me - Hart, pmsl, what a dick.
Anyway, in all seriousness, everyone on this planet is far better educated than at any time in history, in the big scheme of things grammar is extremely unimportant to the masses. However, for an important legal documents it could be the difference in how a judge sentences someone, it's all relevant. But poor grammar, won't end the world.