Your reaction to the parent says more about you than the point the parent was trying to make.
>[If] you only like top-shelf sushi prepared by world renowned chefs....
>[If] you will only drink wine that you've read is good...
Both of those are examples of a second-handed appreciation for the subject matter. In the first case, the person is substituting pricing signals and reviewer opinions for their own independent judgement. In the second case, the person is not only substituting reviewer opinions for their own judgement, but also denying themselves even the opportunity to learn how to judge the subject.
An enthusiast or connoisseur is a person with a first-handed view of a subject. In order to develop a first-handed view, a broad understanding of the material, associated topics, and direct experience with the full breadth of a subject is necessary.
In the case of sushi, the enthusiast needs to understand the varying quality of sushi available, methods and techniques of preparation, the flavor profiles of fish, the effect of garnishes and sauces, and so forth. You can't appreciate great sushi until you understand bad/mediocre/good sushi.
In the case of wine, the enthusiast should have extensive experience with wines at many price points, understand the production methods, understand types of fermentation, know the various types of grapes, and so forth.
In my experience, enthusiasts for a specific topic are almost never snobs. I've met beer enthusiasts who don't necessarily enjoy common beers, but they are nevertheless in awe of the production process and uniform quality. I've met wine connoisseurs who dislike many $30 bottles but generally enjoy $2 wine from Trader Joes (aka two-buck-chuck).