The green monster is Oscar the Grouch from Sesame Street.

Thank you! Sometimes my cluelessness in regard of popular culture is embarassing! :)

As to the rest of your comment, no, I don't find it ironic and I don't think that DeKnight was referencing fandom's attitude by The Swell's misogyny - if that's what you imply. AFAIK, DeKnight didn't inderact with fans after the Kittens fiasco - and rightly so.