I think the term I read at one time was artistic snobbery....some snub it if it isnt made by painting on canvas, some if it isnt made by a pro program etc etc etc.  Is it still art if it is painted with a brush yet you dont grind your own pigmenst etc?  yea it gets annoying, but its a waste of time. And youre not likely to change anyones mind. 
.....and I agree with Groucho....
:)