These guys were performing a criminal act. No, it wasn't criminal awkwardness.
The Swingjugend, or Swing Kids, originated in the very earliest days of the Nazis' rise to power. They mostly came from middle- and upper-class German families -- in other words, the precise group Hitler targeted to become prominent members of the Nazi party by offering them special schooling and membership in the aforementioned Hitler Youth. But they eschewed his state-sponsored hatred in favor of listening to a type of music "strictly banned by the Nazis as being 'degenerate' and Negro-influenced."
via Wiki Commons
As depicted in this propaganda, which (while racistly drawn) fails to make jazz look uncool.
Though there are reports of German Swing Kids brawling with members of the Hitler Youth West Side Story-style, they were largely a peaceful movement, their usual form of protest being to categorically ignore the Nazis' strict curfews and bans on foreign music and dancing. Said ignorance ended rather predictably, of course: in concentration camps.