Listen indie bands, listening to hip-hop doesn't mean you are cool, it means you are exactly like everyone else in the entire world. You don't need to tell your fans that you are into contemporary rap music, they can probably guess it since you are a human being that listens to music.
Let me ask you hip hop indie collabo artists a question: "Do you think for a second that Eminem's fans are going to pick up your next record down at Best Buy?" Probbaabbbllyyyy....not. The people who buy Jay Z records at big box retailers are not going to sign up for the next Pitchfork fad just because an Indie band collabos with a rapper on a song for a shoe company: taste doesn't work like that.
Here is an idea: Why not keep your mouth shut about your fandom and try to incorporate some of the sounds and energy that you like about hip hop into your next indie record, because indie could use the infusion of life. In my mind, the main thing hip hop as a music genre has over indie as a music genre is life and energy.