It is possible that the dog associates the clicker with training, and training with irritation/frustration on the part of the previous owner. They may not have been trying to use the clicker as a negative marker, but they may have only used it while trying to train, and with poor timing and inconsistency, they may have made the dog confused, which most novices read as stubbornness. Punishment and harsh corrections follow.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.