D Cancer Bats? Toil Sweat Owkwa O2 Digest: Happy to edit the title if a mod wishes ftr. Megadeth does well in this department as well:. Cancer Bats?
It's upbeat, and the lyrics are even geared towards it particularly OP's thing of no longer being friends with someone Specifically:
The Funslinger. I think the perfect "don't give a shit" song of theirs is Goodbye, Hooray. On a similar note: