This type of elitism has no place in intellectual pursuits.
Think about it. If there is no expert in the room, then nothing is lost by openly trying to reason out the truth of the matter and seeing what sticks to the fly paper of reality. This is how new experts form.
If there is an expert in the room, they will be more than happy to point out issues, and attempt to offer points to guide the intellectual endeavor within the bounds of their expertise. This is also how new experts take shape.
The knowledge wielded by an expert is what makes them an expert. We call it expertise.
It is not the fact they are an expert that makes their knowledge expertise. The knowledge needs no particular person to prove itself useful.
An appeal to personal credentials as the primary determined as to the veracity of an argument is known as an appeal to authority, which is a very common fallacy.