As Barker and Mark Hoppus prepare to perform their first show without the guitarist at the Musink festival in Orange County, California, the drummer has taken aim at DeLonge, telling him it's time for him to cut ties with his old band once and for all.
Barker, who insists there's no "bad blood" between him and the Blink-182 co-founder, tells Alternative Nation, "I think the right thing for him to do would (be to) just man up and quit the band instead of telling people he didn't quit and just be real with the fans. I think that would give him some closure too and really do what he's passionate about.
"Even amongst all the other projects I do, I can always find a way to prioritise and still be passionate about Blink-182 when it comes around. I love playing, listening and everything about punk rock. It changed my life. I think for Tom, he doesn't like punk music and it was a phase for him."
DeLonge stepped away from the band last month (Feb15) after announcing plans to release his solo album To the Stars... Demos, Odds and Ends, but Barker reveals it isn't the first time the guitarist has put other projects before Blink-182.
Barker adds, "I think this is the third time he's quit without anyone knowing about it because we didn't announce the other times. But this is just the last straw. It's just not cool for the fans.
"He'd always agree to go on huge tours and record albums, but when it came down to going into the studio, he'd find some excuse not to. And we wouldn't even hear from him; it would be his management. It comes to a point where you decide you're not going to force anyone to do anything they don't want to do and it's time to move on."
Barker and Hoppus initially announced DeLonge had quit the band in a message to fans last month (Feb15), prompting the guitarist to reveal he was just taking a break to work on his solo ventures.