It is the employees responsibility to make sure the store looks nice, sure. It’s basic human decency to respect people and not make them do bullshit tasks because you’re too lazy to put in the bare minimum.
You’d be agitated too if someone came to your work, threw all your shit on the floor and walked away. Now it’s your problem to deal with, but it didn’t need to be. Someone decided they wanted to choose being a cancer on society and make it your problem.