I always feel a little bit conflicted on this subject!
On the one hand, I do try and use the best English I can and get irrationally annoyed at some things (grocer's apostrophes, people thinking words like 'corydoras' are plural just because they end in 's', your/you're, their/they're/there etc), although I always keep in mind that some people aren't native speakers, or might be dyslexic, and try very hard not to judge.
On the other hand, I appreciate that English is a living, dynamic language that is always changing its spelling and, especially, usage, and I see that as a good thing! I would hate for English to stop growing and changing, and slang and 'non-conformist' usages do help keep things moving.
I think it's a case of 'familiarity breeds contempt' with native English speakers; they just don't take the time to learn to use it properly. I do feel there's something amiss in the education system too though.
Just for instance, my eldest son has an old school friend (they're 23/24) that I know quite well and have as a friend on Facebook; this is an example of the posts I get from her, "Caiden toke his first bottle yesterday bless him so its lookin good now they said four me two ring up tuesday and see if they have any beds four me so i can cear four caiden in hospital till he comes home cant wait two have him home x x"
And I think; you managed to get through school like that?!!!
My fifteen year old, in contrast, is home educated and was asking me yesterday how to use apostrophes for plural possessives correctly! He also uses 'may I?' rather than 'can I?' and 'only' properly, which makes my heart swell with pride