“[Brian] Henson said he had to have numerous talks with [Steve] Whitmire over the years about his unprofessional conduct, which included ‘appalling’ communications with colleagues. … Henson declined to go into specifics about Whitmire’s exact demands, but did say, ‘Steve would use ‘I am now Kermit and if you want the Muppets, you better make me happy because the Muppets are Kermit.’ And that is really not OK.'”