Please do not accuse people of being bots or shills, and if you have proof that someone is a bot (or an actual shill) then mail hn@ycombinator.com
Have a look at:
https://news.ycombinator.com/newsguidelines.html , the bot bit isn't explicitly mentioned but "Please don't post insinuations about astroturfing, shilling, brigading, foreign agents and the like." covers it nicely with the 'and the like' bit.