I would simply say that I greatly enjoy Metal and all but utterly loathe Rap and leave it at that, but while I can safely dismiss the entirety of the genre that has the Hipping and Hopping outright because I really do hate all the myriad varieties found within that genre as a rule, in this day and age you can't just toss out "I like Metal a lot" and expect people to necessarily grasp your true meaning.
The thing about Metal is it's a very expansive genre containing a bewildering variety of bands with an equally bewildering variety of sounds - there are very few "core elements" that one can attribute to all Metal bands universally. People naturally tend to generalize though, and for whatever reason the version of "Metal" that the public perceives is exemplified by the most extreme and off-putting (to general listening audiences) sub-genres out there, or the modern shit that takes those relatively unpalatable sub-genres and then makes it even worse; if they're aware of the less 'extremely niche audience' stuff at all it's probably the old "traditional" fare from 20+ years ago (or modern releases from bands that were around 20+ years ago, which amounts to the same thing in the end).
So to clarify: When I say I like Metal, I mean Metal that the average person on the street hasn't heard of, because the bands that they have heard of are horrible abominations (or really old 'classic' stuff, which I don't hate but am not enthused about either). Pretty much the entirety of the "modern metal" category (Nu Metal, anything with a -core suffix) is irredeemably awful garbage that kids these days like because they are bloody stupid, and you will never sway my opinion on that subject so don't bother trying.
I also do not mean "really obscure Norwegian underground Black Metal" or "the most 'br00tal' Death Metal imaginable!" that a lot of younger Metal fans seem to gravitate towards, which are responsible in the main for the general impression everyone else has of Metal (namely, that it consists entirely of unrelenting sonic onslaughts with vocals that sound like someone gargling battery acid) - I do enjoy quite a few bands that incorporate elements of both those sub-genres mind you, or offshoots/hybrid sub-genres like Melodic Death Metal, but in the main I consider most Black and Death metal to be unpleasant noise.
No, when I say that I like Metal, what I'm referring to are the various (mostly European) bands from sub-genres that John Q. Public doesn't really know anything about: Power Metal, Gothic Metal, Folk Metal, Progressive Metal, Melodic Metal, Symphonic Metal, Symphonic versions of all of the above, etc (and to a lesser extent some NWOBHM and 'traditional' Metal acts). I would toss out the names of my favorite bands, but that would be an unreasonably long list (also I hate classifying things that way).
People who claim to hate Metal all but invariably end up liking quite a bit of the Metal I enjoy once they actually hear it played - my sister would have told you that a couple of years ago, and might still tell you that now, but all the female-fronted Symphonic Metal and the odd Melodic Metal albums in her collection put the lie to that claim; one of her friends heard from her that I'd been listening to Metal all the time recently and announced loudly while I was in earshot that she "hated Metal"... only to tell me she liked the music I was playing an hour or so later (a track from Austrian symphonic Metal band Edenbridge) - I ended up passing a bunch of similar metal albums her way. My father ostensibly loathes anything with the electric guitar, and yet he adores Guilt Machine (Prog-Metal) and various female-fronted Gothic Metal bands. Heck, I've even gotten soccer-mom archetypes to give Metal a fair shake.
That default "oh I don't like Metal" mindset is the reason most of the bands I've discussed in my Guide to Good Music [http://www.escapistmagazine.com/groups/view/Guide-to-Good-Music-notification-service] have been some variety of Metal - a lot of people would like it if they can be persuaded to overlook the "Metal" label and just listen to it.