I usually just go answer it. If I don't they'll just keep coming back. You'd be amazed how well saying "you have a real nice day now" and closing the door before they can respond works lol
How fucking neurotic has the internet really made people? So many people complain about being alone and never having anyone in their lives and then do shit like this. I know it's just a meme but there's a lot of truth in it and my brother is one of those truths and it really drives me nuts.