This is like saying that "Just build it and they will come". And look what happened to Kevin Costner's career after that..
Seriously. Ignoring people who upset you is like doing the following :
Attack them until they do the inevitable :
"Self Destruct".
Look what happened with "Boobmaster", "SexEducation", "Lawrence Connor"...
Now that sexeducation is back.. Many people will use the lame ass excuse "Well.. just ignore him". DUH!? Welcome to Utopia. This is like saying that TGP will stop existing because you are not using FREE PORN.
Attack him. Always reply. And the fucker will finally do something wrong and get banned.
Thank you. Good night.