Some ponies never change; even after the CMC's managed to get their cutie marks, Diamond Tiara still wouldn't let them off without being picked on any more. But when they sling insults back, and Silver Spoon fails to come to Di's defense, an argument leaves the two teenaged fillies relationship on thin ice.

But you might say that Silver Spoon has a special talent for situations like this....

(Everypony's post-graduation in this, but not yet through college/their "young" years yet; not foalcon.)