Eh, how about asking me about const-correctness than inferring from my use of "it's" and "its"? You know, you can actually talk about const-correctness instead of inferring from the grammar test.
> At the very least, lack of proofreading suggests to me you might be rash with your code as well.
It's hard to be rash with code if you aren't copy pasting. It isn't the same as posting comments on HN.
> And on a personal level I don't want to work with someone that communicates like a tween
As I already said elsewhere, you are assuming things to be binary when they are not. The spectrum between "liek dis if u cry everytim" crowd and "People with bad grammar should be hanged" people is quite wide.
> Quite frequently a non-native speaker will stumble upon what is written and be thoroughly confused.
Not an excuse for bad grammar, but a non-native speaker is fine with both "didn't go" and "didn't went". I don't see how he is going to be confused. Non-native speakers are confused when they encounter phrases, idioms and slangs they don't know. Fun exercise - ask an Indian if he/she would like to go out with you sometime. He/she would most likely say yes/no without understanding what you meant. Do you have any examples where simple grammar mistakes confuse non-native speaker? I am a non-native speaker, and am curious to know.