Bubblegum pop possibly, I can't stand the kiddish lyrics, annoying melodies aimed pre-teens, freaky squeaks that the singers do. (seriously, aimed at pre-teens is a definition in wiki).
Rap byt far. Counrty isn't good but the lyrics are quite nice and upbeat.Pop is pretty bad as well especially at the moment with a the soleless talentless creeps about.
Country is okay with me, kids nowadays should learn that without Blues and Country back in the 30s and 40s, Rock N' Roll would've never come into being.
but on the note of worst genre ever, I'd have to say Rap and Techno, hate 'em both with every fiber of my being!