Why can't educated people use words like "your" and "too" correctly?

[Moi!]

I'm talking about university educated people who still write things like "hope your okay", "it was good too see you" on facebook. How can you get through higher education and not know how to write...??

I have friends who don't have any problems using "too # to", they're # their, "your # you're", etc in the correct context even though English is their second, third, fourth language!!! I think it's an absolute embarrassment that native Brits and Americans are unable to speak their own language properly.
Well, maybe if you are happy with a very very mediocre job, but if you want to get anywhere professionally then you have to be able to spell and use correct grammar. As for friends, if they are illiterate too then I suppose it doesn't matter. Haha. I know the difference between Beyonce and Rihanna but to be honest I don't think anyone I know would care if I didn't, as they have more important things to occupy their time with.
Oh go on then Anni.................. don't just say you can, do it!!!
Most people with a 3 digit IQ...? So you consider 100 quite high, do you?