“Fanboy” (* out of four) was a grating horror thriller about a rock band Xenos (Alberto Jurado, Alia Jyawook, Arabella Harrison, and others) on tour and a desperately deranged fan (Ben Johnson) who follows and stalks them on the road. If you’re looking for irony or insight into the world of a touring rock band, don’t look here; film is wretchedly scripted, acted, and directed. Star/writer/director/casting agent Johnson bears almost all the blame for this ugly and unredeeming film. Not likely to develop many “fans” of its own.