I'm unsure of how to pronounce subreddit names in casual conversation without preface. I read
/r/funny mentally as "R funny", but this doesn't always work in conversation, especially with acronym subreddits, like
/r/wtf, as the 'r' could be misinterpreted as part of the subreddit name.
Furthermore, it can be sometimes hard to assume that one is referring to a subreddit if no context is given. For example,
I saw the weirdest thing this morning on
can be hard to interpret if read aloud in the manner mentioned above.