http://ycombinator.com/newsguidelines.html
Specifically the following paragraphs: "Be civil. Don't say things you wouldn't say in a face to face conversation."
"When disagreeing, please reply to the argument instead of calling names. E.g. 'That is an idiotic thing to say; 1 + 1 is 2, not 3' can be shortened to '1 + 1 is 2, not 3.'"
If you've got some criticisms, how about stating them explicitly instead of so off-handedly insulting someone else's hard work?