[nailer]

Not according to /r/help:

https://www.reddit.com/r/help/comments/44498b/how_to_hide_or...

> there is no basic Reddit feature which will hide or filter a subreddit from the /r/All page.

[nsuser3]

Well, the help is wrong then: http://i.imgur.com/YIEduLP.png

[TJSomething]

That page is out of date. They added filtering for everyone in November.