Based on what you might hear from the radio or MTV you might think otherwise but here's latest data from a global ranking database where users tag the genres they like.
In order from most liked to least
rock, jazz, electro, punk, ambient, funk, house, (similar rankings: reggae, blues, metal, soul, techno, classical) ... (50+ genres) ... disco, r&b, ... on the other end of the list ... "pop", country, rap, "emo".
Looking at this I think this ranking might be biased by what is on tv/radio a lot? That kind of cancels it all except r&b & disco which end up being least liked genres of all? Kind of a shame I actually like some disco!