Ye’s use of the word “ign'ant” reinforces and signifies that he really doesn’t care what people think as it’s ignorant to pronounce the word “ignorant” “ign'ant” (much like “aks”). Ig'nant is also phonetically similar to ingots, the bars that valuable metals (like gold) are cast in.
Also, Spike Lee, who has been very outspoken about race relations and portrayal of black Americans in the media, probably wouldn’t appreciate black figures in pop culture blowing their money on gold chains, or being ‘igonrant’ of society.
Also, peep the play on Yeezy’s famous (for better or worse) lines “let you finish”. Note that Ye’s at the point in his verse where Big Sean and Jay-Z finished their verses. Here, he really does ask to finish, his verse going on where theirs stopped.