Just take a step back and realize that you spent more for a pair of sunglasses than a lot of people (including me) have as their total net worth this christmas after the shutdown of many industries (including mine, the RV industry) and be happy that it was just a pair of sunglasses that inconvenienced you.
In times like these it could have been a foreclosure, the lack of access to basic medicine, the loss of your livelihood, losing a loved one to an unnecessary war, the threat of starvation, facing homelessness, the loss of your life savings through no fault of your own, or a terminal disease.
Think for a minute that all you had to do was squint for a few minutes when so many others are busy trying to keep warm because they can't pay their gas bill because the company they have worked overtime and on holidays for decided they were expendable.
Sorry to be a downer, but sometimes you need to count your blessings before you invent an inconvenience.