Because most of the time it’s used on the wrong guitars. Starting with that awful black and gold Gibson Les Paul custom design that refuses to die. Would anybody wear a gold shirt and cummerbund with a black tux? Only if he’s a pimp. Carry this forward to the frightful quilted top red, abalone, and gold crap coming out of South Asia and gold hardware evokes instinctive shudders akin to the revulsion brought on by cockroaches.
And in western cultures gold has become a signifier of low-class douchebags trying to impress people with tasteless bling. Can’t afford to replace your muffler with the gaping hole in it? No problem, you can impress the ladies by wearing this eighteen-karat herringbone rope to the gym! Make sure to accent it with Old Spice body spray and a tank top.