People that buy cheap LEDs because they are too cheap or too ignorant to find good quality LED bulbs with good color rendering and a plesent Kelvin temperature for what they are trying to do.
Most people like 3000K to 4200K for ambient lighting but 5000K for task lighting. Surprisingly, they complain about 6500K having "retina burning" blue - interestingly, a 6500K LED with a CRI above 80 will very closely mimic that nasty blue of daylight. Oh my!
If someone is buying reasonable quality LED bulbs and still complaining, then nothing will cure their negativity.