That stuff happens quite a bit, i've actually looked up the 4 x tank, 2 x healers & 2 x DPS that have done that in the past vis DF: grabbing boss to mess up party trolling. Was suprised they were all from Sargatanas Server when i looked them up on the lodestone.
Defintly need a week ban or something for those kind of people! i dont mind rage quitting in anoying but sometimes justifyed, But trolls that wont pay for repairs after causing damage by doing this dont deserve to play the game!