this seems like a pretty fundamental flaw in the 'ship. not the caring about material possessions or whatever, just the way wacky and ms wacky communicate with each other.
there are loads of people out there who would respond to wacky losing the sunglasses in a much different way ("oh that's too bad, oh well nbd", etc), and not think it was weird or think wacky was being unreasonable.
there are also loads of people out there who would respond differently to ms wacky's initial reaction ("sure no problem, i'll get you some new ones", etc), and not think it was weird or think ms wacky was being unreasonable.
the problem here is that neither one's instinct seems to work well with the other's.

this is a communication/personality issue, not a sunglasses issue