Katy Perry isn’t afraid to give constructive criticism to her loved ones or aspiring singers. In a new interview, the American Idol judge mentioned her parenting style while discussing who could replace her on the competition series after she leaves following the conclusion of this current season. The “California Gurls” crooner, 39, noted the show’s special guests Jelly Roll, Meghan Trainor and Gene Simmons are all good options, but she shared that the next judge needs to be able to express themselves honestly. “I think what’s going to be really important moving forward is that whoever does co…