True. Pointing out how stupid someone is just because they mixed up two letters is pretty stupid in of itself.
I definitely value English skills, writing is a passion of mine, but this is the Internet, not an essay for a professor. My English definitely isn't perfect but honestly, if it's at least legible and you can tell the person actually tries, it really shouldn't matter that much.
Well, I suppose if you aren't acting pretentious or rude, it should be okay to gently correct someone, but some people still might get annoyed by it.
I don't care if you correct me, but if you're doing it to be "smart", no.
But yeah, I agree with you on that. I'm not really talking about you so much as people do it in a mean way.