From guidelines:

   In Comments

   Be civil. Don't say things you wouldn't say in a face-to-face
   conversation. Avoid gratuitous negativity.

   When disagreeing, please reply to the argument instead of 
   calling names. E.g. "That is idiotic; 1 + 1 is 2, not 3" 
   can be shortened to "1 + 1 is 2, not 3."