For the most part, any reference to poor spelling and/or grammar on here is leapt upon - in extreme cases I've seen people called cunts for just pointing out an error. There is a huge amount of sympathy for people who express things in a non-standard way, whatever the reason, and even mentioning it causes ire.
On the other hand, on a lot of the Brexit threads, the spelling "forriners" is used to characterise the expressed views of Leave voters. I assume the reason for this is to ridicule them by drawing attention to their spelling - which is odd.