I find it preferable to answer in neutral style somewhere else.

Like obstinacy and stubbornness, it refers to unshakeable opinions. In this case, ‘My own opinion is different’ (John Wilkie) Unlike other words, pertinacity cannot be used in either a positive or negative sense.

1: adhering resolutely to an opinion perversely persistent 3:

stubbornly tenacious

(or no)