Why do prudes always intrude on ur business?!?

im a 16 year old female and my parents let my fiance move in with us because he had a really bad home-life.....none of the prudes seem to listen to that part....all they see is "oh a younge girl with trashy parents letting her trashy boyfriend move in on the trashy family n their home" well it's not like that.....sorry that we care for people.....geez.....i mean, why are so many people like that? i mean with opinions like that?? me and him get good grades....are safe....and are nice people.....so i dont get it!!