The Dunning–Kruger effect is usually defined specifically for the self-assessments of people with a low level of competence. But some theorists do not restrict it to the bias of people with low skill, also discussing the reverse effect, i.e., the tendency of highly skilled people to underestimate their abilities relative to the abilities of others. In this case, the source of the error may not be the self-assessment of one’s skills, but an overly positive assessment of the skills of others.

https://en.wikipedia.org/wiki/Dunning–Kruger_effect#Definition

It’s real. Once you see that, you can’t unseen it. Especially if we’re talking about someone who’s dedicated their entire life to something highly specialized; they will almost always overestimate the familiarity of the general public with their own area of expertise.