If you had asked, or even just had better luck, the clerk might have explained that there was a reason the glasses were on sale. Rose colored glasses were a common magical artifact, popping up all over the world with various enchantments that affected reality and perception, but these ones had a bit of a...glitch. Two, actually.
Any rose colored glasses work by tuning into your emotions and projecting them onto the world — they look for what you want to see, and make it really be there. These glasses latched onto a different emotion: envy. If someone wearing them looked at a younger brother they resented for being taller than them, the brother would grow even more tall; if they looked at a friend they envied for his success with women, the friend would grow even more attractive to the ladies. That's the first glitch.
The second is one of perception. Whereas most magical items leave the user aware and the world clueless that reality changed, these glasses take a...different approach. When their user's envies and insecurities are made even more extreme, the person wearing the glasses is completely unaware, as is the rest of the world. The only person who notices anything has changed is the person who *gets* changed. The glasses mess with psychology a bit to make the changes not come as a shock, and to make the changed individual lean into their role as someone to be envied, flaunting their new trait. They also affect the mind of the wearer, making them always willing to try using the glasses again no matter how many times they seem to have no effect.
It's possible that a lucky wearer may find some way to circumvent these glitches. It's unknown, for instance, what looking at yourself in the mirror would do. Overall, though, these rose tinted glasses are a recipe for disaster. They take everything in the world that makes their wearer feel lesser than, inadequate, or invisible, and turns the dial up to eleven.
And you, walking home, excited to try out your bargain magic item, have no idea what's about to go wrong...