Is this a common problem in Denmark?
Maybe, if speaking about the northern winters. Like that's why Swedes paint their houses brightly.
I hope not!
Can you also use this to express that you see only positive or negative?
Oh:( Du er en hund!
My Danish mother tells me that, although this is correct, it would sound more natural to her to say "sort og hvidt", because sort - ending as it does with the letter 't' - "feels" as though it is neuter gender. And it does sound nicer to say :)