Keith Urban’s comments about Miley Cyrus’ singing voice ruffled feathers. The dad-of-two mentioned the “Wrecking Ball” crooner during a recent appearance on the Australian radio show Fitzy and Wippa with Kate Ritchie, where he performed a rendition of her Grammy-winning tune “Flowers.” “I love that voice, man, that voice. She sounds like an ashtray,” the country star, 56, shared of Cyrus. “And I mean that as a compliment. She sounds like the carpet at the RSL!” Fans had mixed reactions to his words, with one person tweeting, “That’s quite a strange way to compliment someone! Wonder what he mea…