I hate metal and like watching football. But I'm on the cusp of turning thirty. Perhaps you need to do a larger survey where you also collect ages.
(Also, even though I've been here for a long time, freeways are called the. As in I take the 101 north to San Jose. But that is a wholly separate argument. :D)
Do I have to grow 40 to realize that life is unfair and finite, happiness is a choice and that I may, in fact, have my own opinion?
I love metal and going to symphonies and I really loved the SF symphony and Metallica.
I also love football, hockey, and F1, but I'm a very competitive guy and just love competition in general, like the Olympics etc. As I grew older I like these sports more as I discovered the coaching and game playing side of things. Seeing a team outplay a physically more talented team is gratifying or watching Ferarri/Redbull/anyone beat the superior silver arrows. The underdog stories are delightful to watch when they happen.
Doing rec sports, board games, video games, poker, laying down more mulch when helping a friend, growing better flowers, code golf, and obviously trying to build a better product than our competitors in software. If something can be measured or has a "finish line" I want to "win" it. When I am "defeated" I want to better myself for the next time.
I enjoy watching sports the same way I enjoy every tech talk by the almighty Carmack. Seeing someone at the top of their game has appeal to me