The 'grammar police' are fuck all to do with grammar.
They are people who pick on other posters. And just as much a set of arses as all the others who nitpick about anything at all.
The people who actually care about language on MN have their own topic, and people are always surprised at how warm and interesting it is. And we only correct people if they ask for help by starting a thread
That said, one of the things I like about MN is it's inclusive nature, which does mean a major shibboleth against txt spk and other contractions (makes life harder than it need be for those using assistive technology) and a general presupposition that everyone who can write clear standard English does so - because that is enormously helpful to those with dyslexia and those for whom English is not the first language.