I'm showing some ignorance here, but I always thought a bot was something only sent out by a search engine. Like Google or Yahoo.
Thus, if you wrote an application that searched content on the internet, I wouldn't consider that a search engine bot, which to my knowledge is what robots.txt is trying to block.
But this may just be selective ignorance, because I might do it until the webmaster of that site contacted me and asked me to stop :)