The rapper fell into the bottom two alongside Stacy Francis and performed again before the judges in order to fight for his place in the competition. However, he became frustrated and initially stated that he didn't feel like rapping for people who did not want him, though he eventually went on to give a lacklustre performance.
While he was allowed to stay in the competition, the 15-year-old's behaviour has drawn criticism from the judges and his fellow competitors.
Writing on his Facebook page, Astro apologised for his outburst, saying that having time to reflect on the experience allowed him to see the error of his ways.
"What I do, I do for the love of hip-hop and my fans, and I would never do anything to hurt either. But please try to understand where my head was last night. Muhammad Ali was hated by America when he didn't enter the draft," he wrote.
"What people didn't know was that he would have entered if the recruiter would have addressed him by his new name. I believed I was being mistreated, and in the moment I thought about Ali's moment. I want to be the new ambassador for hip-hop and a leader of a new young movement of positive kids, but to be that I must have integrity and honour first!"
Astro also explained the reasoning behind his actions and promised fans that he would redeem himself next week.
"People are saying I'm 'cocky' and 'arrogant', well maybe I have watched too many Muhammad Ali films or maybe I grew up having to fight my way home everyday or battle on street corners of Brooklyn for respect," he continued.
"My guards are always up, and maybe I took the situation too heavy. I seriously apologise to my fans, what I said and my emotions weren't directed toward you. I'm 15 and I think I know everything, but the truth is, I don't, and I handled the situation wrong! Win or lose next week, I will make you all proud!"
Showrunner and judge Simon Cowell has admitted to being "frustrated" by Astro, and advised him to "eat a huge slice of humble pie" next week.