Never!!! Never n Never even encourage her to cut it!!! Dnt care abt what other ppl say!!! Care only abt your wife dude!!! Think of all the time, effort and years it took to grow her hair that long!! If she didn't like long hair, she wouldn't have taken so much trouble!!! So just tell others that you will never encourage or allow her to cut her hair!!! N its a pleasure for you to help her and care for it!!! Guess they just jealous!!! My best wishes to you and your wife!