The whole point of UI/UX is to provide a good experience for users. Users know when they are having a good experience and part of the role of a UI/UX practition

The whole point of UI/UX is to provide a good experience for users. Users know when they are having a good experience and part of the role of a UI/UX practitioner is to collect and synthesise this feedback. A practitioner who ignores feedback and says "who's the UX professional here?" is not a very good one.