First, I shall discuss "the rest". Enough said. OK, moving on...
Now we have the "B-graders" - often called 'wannabes'. These people copy slavishly the "A-graders", picking apart any other B-grader's attempts to 'do' anything the A-graders do, as it is always just 'not right'. Of course these wannabes also often dump on any true A-grader that they may stumble across unless they are TOLD (by one of the other A-graders usually) that so & so is a A-grader.
The "A-graders"? - well they just DO it, without thinking too much about the WHY or WHAT really very much.... ;-) The B-graders often call then 'geniuses', etc...