I can't tell if that's a condescending smirk or a pained grimace. Either way, this is totally how Green Day and Blink 182 will be remembered: not as the bands who turned punk into pop, but who were punk. Sorry, 1977!
Although if my kid was sitting in an office chair in the middle of the room singing sporadically to himself without any music playing (I don't see any headphones!) I'd probably contact the neighborhood exorcist STAT.