Adam B. Vary
February 02, 2012 AT 12:00 PM EST

The rivalry between American Idol and The Voice shows no signs of cooling down any time soon. On Friday’s episode of The Ellen DeGeneres Show, The Voice coach Adam Levine took Idol‘s Randy Jackson to task for Jackson’s comments last month during TCA press tour that NBC’s upstart singing competition show is more for “second chance people” than true musical discoveries. “The winner of The Voice, I will remind you,” Jackson added, “was an artist who had a deal at Capitol Records for several years, a failed contract.”

“Shame on Randy Jackson for saying that,” Levine told DeGeneres, herself a former Idol judge. “Because he of anybody should know that if you’re in this business you need second, third, fourth and fifth chances. So we love and embrace having that being part of the show.” Levine, who was joined by fellow The Voice coaches Christina Aguilera and Blake Shelton, does credit Jackson for being “a working musician [who’s] had a lot of success,” but he contends Jackson’s comments were “irresponsible.”

Check out video of Levine’s comments below: 

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Read more:

‘American Idol’ judges and producers diss ‘The Voice’

‘American Idol’: Portland ratings drizzle

EW’s ‘American Idol’ recaps

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