There are a great many issues that you see all the time that will never really go away, so it's natural to be short with people who post them. For instance, elo hell posts. elo hell posts will always be around, but they will always be stupid. They're always going to get the same arguments against or for the existence of it. Should we be annoyed by them? Hell yes!
I don't think we're snobs; I like to think that the rest of the community just needs to use the search bar before they post. If it's an "elo hell" thread or something that everyone thinks is exclusive to them, some people have to stop thinking they're "the special snowflake" that is good but can't carry because their teams are always such trash. Maybe then we'd have threads to complain about.