Essentially, whenever I look into communities of things that I'm interested in, I'll see a dedicated core of people insisting that it must be experienced a specific way, and any other way is wrong. Basically wine snobs, but for everything.

However, if I'm an outsider looking to get information for a gift or something I have a passing interest in, this can be quite often useful. If the snobs acknowledge something as legit, then I know that it's likely to be good.

Edit: Karrot_Kream put it perfectly with their use of the phrase "gatekeeping". Special interest groups have this problem, and Reddit fails to solve it.