Unhappy insecure and silly people are frequently keen to condemn things about which they know nothing. The USA, with its toxic religiosity, is more backward in matters of sexuality than most of the OECD and so it's not surprising that foolish people make inane comments about the lifestyle. I can't help but remember the most apt definition I've seen of a Puritan: "a person who is consumed by fear, jealousy, and hatred that someone else, somewhere, somehow, may be enjoying themselves." In my experience people in the lifestyle are generally more interesting and certainly more emotionally mature than ordinary people, and because they have frequent outlet for their sexual energy, are far less likely to inflict harm on others. It's generally very unhappy people who seek to hurt others in order to attempt to feel, for a brief moment or two, slightly less awful within themselves.