Some native speakers make consistenly mistakes in writing "its" instead of "it's" or vice versa.

Spelling errors and 'make consistently mistakes' was atrocious grammar however I need to let you in on something...

..they aren't making a mistake. Its not proper but its not a mistake. Its something we've seen with the rise of texting and twitter but you might notice in a quick reply to you in this setting I'm doing it too.

This is something only a native-English speaker would know. Whereas ethnic 'dirty Europeans' like yourself wouldnt know that this and would (as you have here) misunderstand it. Then pass this misunderstanding along to ESL students in turn.

So that's why you dancing almost-white monkey's can't do as well as we can when it comes to teaching real English. Your fake English just can't cut it.