In an interview with The Hollywood Reporter in February, Kelsey Grammer, the actor best known for the TV sitcom “Frasier,” was asked about the swift departure of Rosanne Barr from the reboot of her show last year. Considering a restart of his own popular show, Grammer was encouraged by the initial success of Barr’s reboot. But in May of 2018 Barr insulted Valerie Jarrett, the former Obama administration official, with a comment on Twitter that…