I don't hate rap/hip hop at all. I think it's very important socially, but I don't consider it music at all
It is ok to not like it - I don't care much for country or opera but I do not dismiss these genres out of hand. In fact, on the contrary, I can appreciate a fine musical performance of both it is just that I do not collect a lot of CD's of this type genre (I have a few dozen opera and country discs but that is all)
Another example is Punk - I do not care much for that but I sure appreciate what it gave us - Blondie, The Clash and a while lot more were inspired from Sex Pistols...