You seem to think tanned means burnt.
Everyone is slightly darker at the end of summer compared to the end of winter even when wearing spf50 and a hat. It is the body's way of protecting the skin from burning.
The only way you could completely avoid even the merest hint of colour change would be to stay indoors completely and obviously that would not be healthy via a vis vitamin D
It's rather peculiar that you would suggest that any change in skin colour makes people look awful. In a huge part because people come in an endless range of colours do to suggest that anyone with browner skin looks awful is somewhat questionable.