I've personally found people that don't come back to respond to any comment whatsoever to be of the most frustrating sort. They tend to seem to drive-by attack, possibly with an essay of a statement, and then when they're called on it, or when someone tries to help or clarify, there's silence.

Come to look at their account and they post maybe once every 3 weeks and never respond to a single thing that is a response to their post.

I've even considered making scrapers to find and avoid those kinds of users; but that's just me.