According to the series “This Is Pop” on Netflix, the award rapper, singer, songwriter and record producer, said on an interview that on a flight to the 2013 BET Awards, flight attendant woke him and told him Usher wanted to speak to him in the back of the plane. T-pain met him in the back and allegedly told him that he has messed up music for singers because of his usage of auto tune.
T-pain said that this sent him into a deep 4 year depression, because he really felt like he ruined music. Although he was not the inventor of auto tune nor was he the first to use it, the words still hurt his feelings.
See video clip for interview.