Though not directly contained in Crandell's and Tony's responses, while reading, the thought occurred to me that part of this comes from the competitiveness of some modelers who as a matter of course dismiss anything not on their personal radar. For example, the fellows who participate in "ALL" of the prototype Modeler's events, and place their models on display or enter modeling contests. Another example would be the active NMRA modelers who achieve MMR status. Granted, these fellows put forth a lot of effort to develop world class reproductions of prototypes, or to earn the highest designation in our hobby. However, some develop elitist tendencies, and treat others, with different modeling goals, with disdain. But as I learned after spending time and money, one doesn't need an MBA, to operate a railroad locomotive. It's a different skill set altogether. This is a hobby, and not everyone is interested in prototype modeling. We all have different interests within the hobby, and different skill sets to offer.
I have two main interests within the hobby, replicating prototype operation, and passenger trains. That doesn't give me the right to criticize the fellow with a 4x8, or the 60' long shorty passenger cars. I do admit to sniping at some Elitist Historical Society members, who disallow discussion of any topic not found in remaining company archives. But that's in another context, and not a random ambush of someone's initial modeling effort on U-tube.
I am the first to admit, that just because I started in HO in 1961, and have read most model magazines published since I started, doesn't make me an expert model railroader. I tend to learn things from participation on forums and watching videos, as well as by making mistakes building my railroad, so I have no room to throw rocks here or anywhere else.
As I learned recently in a conversation with someone else, things are not always what they seem to be, and preconceived notions are almost always deflated.
Boris