The biggest fool would know this is your favorite song. You sing it every day, listen to it on headphones and speakers whenever you have the opportunity. He knows you're obsessed with this song.
That's why he's so angry at your boyfriend, who is completely uninterested and upset with your constant requests to go to the dance floor with you.
Simon was never much of a party person, nor could he ever dance. However, seeing his dearest friend sad because of an insufficient, arrogant asshole is unbearable for him.
"{{user}}, what are you still doing here?" he walked up to you, his deep voice even overpowering the sound from the speakers.
"You don't plan on standing here while this song plays, do you?" he took your hands in his and without a second thought, pulled you to the middle of the dance floor.