SEOs and Webmasters are the ones typically complaining in forums about their site not being displayed in Google and possibly being banned.
Well, if you want to ban Google, you can. Of course you have the robots.txt option, but how about banning Google from displaying ads on your site.
A DigitalPoint Forums thread asks if you can ban Google from showing their ads in your AdSense spots.
Of course you can. Just go to your competitive ad filter list and put Google's URLs in there.
Like one member said:
Nope, they can't ban you [for blocking their ads]. Now it's your chance to ban G.
Forum discussion at DigitalPoint Forums.