Sun Jing leaving the class reps stuff laying in the street and then mocking him in class over it was the end of my appreciation for her character.
I don't think she was mocking him at all and her reason to leave them was pretty valid i thought.
Yeah, agreed they weren't mocking, and it's a little iffy on the absolute best thing to do in that exact situation:
In the abstract, you pick up the stuff and take it to whatever the official lost-and-found office would be.
But if the person has just dropped the stuff moments ago, they may be backtracking thinking they know where they dropped it, only to find their belongings missing, with no idea where they might have gone.
Now, why the Doltish Duo thought finding the stuff was so cool is a little unclear, and for a supposedly meticulous fussbudget, Tattletale really lets his stuff get out of control.