Then put him on ignore. There's no rule that says you have to respond to every single post by every single person. A simple acknowledgement would be common courtesy, but not obligatory. There's simply no call to make some grandstand play out of it like you tried to do.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
