I honestly don't think it was a diss.

The Iggy/Azaealia line clearly references how their fanbases are clearly divided. People ARE banking on one of them to be BIG and its a line drawn in the sand. The next bar is 'Pretty damn amazing what you do to be a star/Rolling Stone dude gave us one' I do not think is a diss towards Banks or Azalea, merely referencing that you have to do crazy things to be a big star.

idk, people are reaching