Genres I don't like, some more than others: rap (my least favorite), country, anything auto-tuned, Lawrence Welk, elevator music, seventies disco, formula rock (Journey, Foreigner, REO Speedwagon, Boston), lots of the eighties MTV stuff, some of the old-time crooners/singers (some are OK, like Sinatra...Bing Crosby is a no), Celine Dion (not a genre, but cringe-worthy enough to mention), Death metal, among others.
Now that I have offended some people (especially the Journey/Boston fans!), I am well aware that music taste is just a personal preference and there is no right or wrong. I don't care for Justin Bieber, but his music isn't for me to begin with...it's for teeny boppers. Rap is not written for me, either. My mom loved Lawrence Welk and my dad loved Ray Conniff and Ann Murray and I couldn't stand them.