That's because you're not aware of how hip hop started, its roots, and what it's truly about, and your denial to respect the opinions of people who grew up listening to it, is mocking in a way too. I'm not sure what you do for a career, or something else you're passionate about, but imagine if I started saying "well, what you do for a lifestyle isn't that important. I mean, I don't get why you enjoy doing it so much" I'm sure you'd come back explaining why you chose it and explain so I might understand the intricacies and nuances so I can appreciate it better. Then after you took the time to do that, I still was like "Eh..whatever. I still don't really care". It's cavalier and somewhat rude. I'm sure you don't think it's that big of a deal, but for a lot of people, hip hop is life. It's their passion and they have very strong feelings about it being taken for granted. Try not to trivialize that.