Noise pollution

Making private use of public air space is common practise in these parts, and is overwhelmingly tolerated, if not enjoyed, by most Mexicans. A foreign visitor´s comments about such out-of-place "noise" almost always evokes the trademark "shrug" from locals. We don´t know that there is a social irritant more grating to visitors than inappropriate, loud music. Nor is there likely a subject where cultural views are more divirgent.
Hey...it could have been techno-beat-hiphop-rap played through supercharged double-bass woofers --suicidal at 3.00 a.m.