I know how people would likely answer this, but I'm just going to say, I disagree that the two are different: How come it's okay to correct someone's math, but not their spelling/grammar/usage? I don't mean people should be constantly correcting others (I would find it annoying if it were done repeatedly or under certain circumstances, but on the other hand, I like to be corrected, because it improves my skills), but just why are they so different in acceptance?