All humans we've seen seem to accept the gems pretty readily. Connie was unphased and even thought Steven and his powers and family were cool. Most recently, Uncle Andy mistook them for hippies and treated their powers as mind tricks. Even Connie's mom somehow thought gem monsters were car crash victims. So what gives? Are humans just really oblivious, or has weird stuff just been happening all over the Earth for thousands of years and people just accept it?