The existence of r/4chan is met with scorn every time I've seen it mentioned on 4chan. People seem to either completely hate Reddit itself, or meekly admit that they follow a few tiny subreddits. Given that (and the response you received to your question), it would seem that r/4chan is composed entirely of people who don't actually browse 4chan! One has to wonder what proportion of these members of the "Hacker News Google+" community actually participate on HN.

The more I think about it, the more strange the existence of these offshoots seems: The average 4chan user hates Reddit, and the average HN user seems to not care much for Google+, either (though I'm not sure if that has more to do with its community or the way Google is currently shoving it into everyone's faces).