Lil Wayne and PepsiCo decided to part ways after the rapper offended the family of civil rights figure Emmett Till. Wayne stopped short of an apology to Till's family privately in a letter but expressed regret for the lyric.
And Rick Ross and Reebok split after the rapper issued a verse about using a drug to clandestinely incapacitate a woman before having sex with her.
Cole has been in the spotlight after his recent album Born Sinner jockeyed with Kanye West's Yeezus when released last month and reached No. 1 on the Billboard 200 the following week.
That album also contains moments that some might consider offensive. In Drake's song, Cole raps that he's "artistic" while his rivals are "autistic, retarded".
Cole wrote that when he first heard a backlash from those who deal with the developmental disorder, he immediately realised he went too far.
"I was instantly embarrassed that I would be ignorant enough say something so hurtful," Cole wrote. "What makes the crime worse is that I should have known better."
Cole goes on to write that he's inspired by those who reached out to him: "I have now read stories online from parents about their struggles and triumphs with raising an autistic child and I admire how incredibly strong you have to be to do so," he wrote.
"It's touching. It also makes what I said even more embarrassing for me. I feel real shame."
- AP