For those unaware, a short history of the two's beef goes like this:
As far back as September of 2012, Azealia Banks went on one of her now notorious Twitter rants, and Iggy was just one of a number of artists caught in the blast. "And fuck Iggy Azalea," she tweeted. "I had a song called 'Pussy' before she ever did. Here's a link to my song. It's better." As far as Banks disses on Twitter go, it was fairly mild.