Humor requires insight

Pres. Bush Sr. is a fan of Dana Carvey's Saturday Night Live impersonations of him ("Wouldn't be prudent..."). Carvey is funny enough here that even his target appreciates it because Carvey had some insight into G. H. W. Bush's personality (type ISTJ). Contrast this with Barbara Streisand:

There was Streisand, enduring a smattering of very loud jeers as she and "George Bush" _ a celebrity impersonator _ muddled through a skit that portrayed the president as a bumbling idiot.

This presentation of Pres. G. W. Bush simply lacks insight into his characters and his flaws.