Not exactly a "berserk button" but Diamond Tiara trying to dismiss Granny Smith as "just a kooky old lady" even after her story about the zap apples, zap apple jam, Stinking Rich and Ponyville won the class over to Granny is the final straw for Apple Bloom.
"She is NOT a kooky old lady! She is the most amazing pony in all of Ponyville!" goes Apple Bloom as she stands by Granny and unashamedly embraces Granny.
Of course, news of Diamond Tiara's last-ditch zing at Granny gets back to Filthy Rich...and sets her up for the Laser-Guided Karmic Cool and Unusual Punishment (dressing with bunny ears and helping her classmates sing to the watering cans, without the presumed benefit of the zap apple jam).
Not exactly a "berserk button" but Diamond Tiara trying to dismiss Granny Smith as "just a kooky old lady" even after her story about the zap apples, zap apple jam, Stinking Rich and Ponyville won the class over to Granny is the final straw for Apple Bloom.
"She is NOT a kooky old lady! She is the most amazing pony in all of Ponyville!" goes Apple Bloom as she stands by Granny and unashamedly embraces Granny.
Of course, news of Diamond Tiara's last-ditch zing at Granny gets back to Filthy Rich...and sets her up for the Laser-Guided Karmic Cool and Unusual Punishment (dressing with bunny ears and helping her classmates sing to the watering cans, without the presumed benefit of the zap apple jam).