Pop punk is just being thrown to any band that is young and plays rock music these days. It may be marketed as pop punk, but that doesn't make it pure pop punk. Pure pop punk is technically stuff along the lines The Ramones and a good example for today would probably something like Set Your Goals (at least I think so). You can argue for an against Blink 182 being pop punk, but I'd say that the self-titled was the least pop-punk of their discography.
I'd actually say Blink-182's self titled album is more pop punk than Set Your Goals, who seem more like punk rock to me. To me they're two completely different genres, but maybe not... oh well, whatever