People are already pushing back to one-way collection of such data in public spaces, so I would guess that an implementation that does that and directly acts on it (effectively pigeonholing you in a generic musical preference cohort based on age and sex) would cause an even stronger reaction.

In the Netherlands a couple of those companies that rent out screens with advertising in the public space placed new versions that included a camera above the screen meant for measuring people's reactions to content shown, detecting demographics and mood. After public backlash they promised these were deactivated until the legal situation became clear, but by now they've stuck thick badges over these with their brand name. I guess they got sick of people putting stickers over the camera holes.