I remember facing this situation a couple of times and all I did was ignore the initial "Hi", after a long time my interlocutor would insist "Hi? Are you there?"; and then I would finally reply "Yes! I just thought you would continue to write your message and I was waiting".

This "play dumb" strategy worked great for me and I think it has less risk to be perceived as "rude" compared to sending a link to the nohello.com site.