Original sentence: Cowell's fame (or infamy) grew, fed by his signature phrase, "I don't mean to be rude, but …", inevitably followed by an unsparingly blunt appraisal of the contestant's talents, personality, or even physical appearance
Edited sentence: Cowell's fame (or infamy) grew, fed by his deliberately insincere signature phrase, "I don't mean to be rude, but …", inevitably followed by an unsparing denigration of the contestant's talents, personality, or even physical appearance