Bad site crawling software

So there's some person who visits my site that just annoys me.  Whatever they use to visit my home page crawls it, ignoring the robots.txt for my site.  So, to whoever you are, your software bites.  Whenever you scan my page you go and vote for and against every single post on a page, which seems like it would take a heck of a lot longer then just loading the page by itself.