My biggest gripe is primary coloured instruments - was it Fender himself who questioned who on earth would want to play a blue/red/green etc guitar? Someone high profile of the time did, anyway. I heard it recently on an episode of 5 Watt World.
Instruments should either be black, white, or some kind of wood grain/natural finish - like classical instruments - if someone turned up with a metallic red trumpet you'd think they were a right clown... And headstocks should always match the body, no matter what.
What's especially bad is when you have a primary colour instrument with a non-painted headstock, rosewood fretboard, and coloured pickguard. 🥲
Like this fella here... Four different colours going on and none of them really match, just tacky. No style, no consistency.
it would look more acceptable with a matching blue headstock and a white pickguard. (but still wrong)
/