Why do people feel like its there personal job to correct others spelling and grammer? as if they make?

no mistakes themselves? to those of you answering this question who do, do that , how would you feel if someone corrected every mistake you made?

and thats a real question i want to know.
Update: ok then brian it's learned not learnt
Update 2: its cool to correct some one but don't do it condescendingly like all of you do, do.
Update 3: also most of the time they are mistakes. its not that they don't know its that they made a mistake so its a little irritating for people to correct MISTAKES that others make. i understand if someone is writing a story but otherwise.
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