> Someone on HN responding to you with single-sentence responses? Either don't respond, or respond in kind.

Or, depending on the context, perhaps give a thorough enough answer with citations that it should either answer questions on the topic fully or explain where anyone interested in the topic can do their own research, such that if the question is asked again one could just link to your previous post.

This might not satiate a poster if they're dumb enough, but it's worth remembering that the post will be searchable and usable for reference by other people.