You are on the internet...Not everyone had a chance to attend Cambridge, or Oxford. Get a grip....BTW, I don't even care a little...
1) It's common sense (or should be).
2) You don't need to go to Cambridge or Oxford: all you need to do it watch this: YouTube.
But, I really could care less, if people carry on saying: "could care less" - so stop it; say: "I couldn't care less."