That's simply not true. I've worked with doctors who write emails in "lol this is for u" format, and by merit, they obviously know how to write.

Although something that is illegible is certainly unreadable, you have hit here on the fact that the converse is false, explaining why we need both words. (I.e.: a piece of writing is illegible if the glyphs that constitute it cannot be discovered; the unfortunate comment you found was made only of recognisable glyphs, so perfectly legible, but unreadable.)

(b) very likely un- or undereducated compared to you

(c) very likely poorer than you, and that's poorer even if you live in a dorm eating ramen and

(d) it's prejudice that I'm commenting on, not your social filters

(e) all the evidence points to that, as I said clearly confused and frustrated person, thinking that they just signed into Facebook and wondering why it appeared to them to not work right. Are you saying that you're a bastion of clarity and even temper when you reach an impediment like that. Sure you don't spell bullshitttttt like that. So what?

[Edit:] (f) It's people protecting their social values with oppression or prejudice who are quite the malicious danger, aren't they? Exhibit A: Fox News. Not so much computer illiterate youths who use a potty mouth

(That is, unless I'm talking to someone who likes oppression too, unlikely but possible, as in, on the Internet, no one knows if you are a dog. ;-)

But the really sad part is that lots and lots of other people are prejudiced, and they think that's a good thing.

Note that I did not bring into this random correlations to other social injustices, but I ask you to consider all those many many many southern god-fearing americans who love them their prejudices, and think god gave them that right. They are protecting their culture with their social filters too.

In any rate, judging someone based on how they communicate is morally very different from judging them based on who they are. Communication is action, and if one cannot form opinions based on the actions of others, then indeed, what may we do? Passively observe the world go by?