I don't like Old rock either (with a bunch of exceptions of course), because alot of bands are just boring.
Beatles have some great songs, course they do. But I don't like them all, I don't even like most of them.
I listen to Metal, Techno, Alt Rock, Classical, and a few exceptions here and there.
I do not listen to any Country, 99.9% or rap/hip hop, and 99% of pop.
Why? Because the stuff I listen to is real music.
Classical is the most fundamental type of music, because it is, lol, you can't even argue that it isn't.
I like Classical because it just sounds good, and while it can be very technical and complex, it can be very simple and still be beautiful.
I like Classical because you can make any sound, any mood, anything; by using a piano, a violin, or a few woodwinds.
The beauty of Alt Rock is it is Alternative, meaning there is no way you cannot like at least one Alt Rock band, because it is so incredibly diverse.
I like Alt Rock because it is always fresh, and the diversity of sounds that any one (good) band can make is absolutely astounding.
I like Alt Rock because the ability to make a heavy thrashy song mesh into a slow acoustic song, is really sweet.
Techno is just about as artificial as you can get, and you may think "well why don't you like Pop then?" and I'll answer that in a moment.
I like Techno because it can make any sound a human can think of. Dinosaur roar? Check. The sound a grenade would make if it was thrown into a blender? Check. What AC DC would sound like if it was faster, had less suck, and different instruments? Check.
I like Techno because it uses auto-tune the way it is supposed to be used; mockingly and sparingly. Everytime you hear auto-tune in Techno, it is used in a way that you know auto-tune is being used, and the artist does not try to say "oh, thats actually that person's voice, not tune-age" (there are some non-auto-tune singers in Techno songs of course). Besides that, Techno is the only form of music that can make me detach from my body's senses (no, I don't use drugs, lawl)
Metal is my favourite kind of music, but I don't like 100% of Metal. That would be stupid.
I like Metal because it just sounds awesome. When the chords and instruments mingle together in certain ways, the sound feels warm. I have no other way to describe it.
I like Metal because like Alt Rock, it is so incredibly diverse, and can make just about any sound and feeling happen all in one song.
Now why don't I like Rap, Pop, and Country?
Easy!
Country: Here is every single Country song you have heard, and ever will hear: My dog/horse/truck/girlfriend/job/friends don't like me/like me/want me to die and want to leave me/party/random. 90% of songs are on the more negative side. Once per album, the word "honkey tonk" will be used. Every single Country singer will wear jeans and a cowboy hat, but less than 1% actually have been on a farm ever.
To me, the entire Country genre seems to be mocking the real Cowboys that existed in the past, and were genuinely badass.
Pop: Auto-tune, repetitive lyrics/topics, and most of the songs just sound really stupid and lame.
Rap/hip hop: Oh wow, you're so gangster! You teach that ***** what to do! YEAH! Do what to the coppers now? Shootz them? (all of that is incredibly repetitive and doesn't even sound good. Saying ************ more often than Samuel L. Jackson, is not cool?)
TL;DR version:
I like Music. Good music is good, Bad music is bad, and like any music, the old stuff is liked by the respective generations because it was their music growing up