The font has nothing to do with the thread... The font is the type of letters, so to speak. You see that the text he wrote was written with letters looking different? That is because he used a different font.
His suggestion is to use the font he used above as the sarcasm font in on these forums, as sarcasm often is misunderstood when used in text.
As for the actual suggestion, I think that it will be very difficult to make people unite around a specific font, and having only a few persons using it would rather cause confusion than clear things up.