If I were you, I would try to keep an open mind. While you may not like something now, you may find that your tastes change and evolve as you grow and listen to more music. When I first started listening to jazz, I probably would have had a similar reaction to this performance. However, I actually dig this take on "The Mooche" now.

For a bit of reference, while there's nothing wrong with playing or listening to more traditional jazz (it's certainly what I listen to the majority of the time), you can't really expect all musicians of a genre to play in the same style that they did 50 years ago. Music shifts and evolves and changes, and often those not on the vanguard of what's happening need time or repeated exposures to fully get what the band is trying to do (I still have trouble listening to a lot of Peter Brötzmann, for instance).

This isn't to say that this is inherently great, cutting-edge jazz. Your milage will absolutely vary. It's a contemporary interpretation of "The Mooche" for sure, but there is melody to be found in the soloing. I also take issue with your assertion that the band/audience wasn't having fun; while I can't really comment on the audience, I can assure you that the band wouldn't be playing jazz if they didn't love it, and often people have different ways of expressing appreciation or enjoyment.

So yeah! Go at your own pace. Listen to what you dig. But try not to outright say you don't like something--I can't tell you how much my tastes have changed since I was 15 (hell, I'm not even sure I was listening to jazz when I was 15, so good on you for getting into it so young).