What does this below sentence mean?

What does these below sentences mean?
#1. I don't wanna hang out with wannabe corporate sellouts.
#2. "you're gonna bea funny little footnote on my epic ass."

epic ass?

the lines go like:  (in the movie , The school of Rock)
-------------------------------------
-Theo wanted you out. man
There's nothing I could do.
-Shut up, man. you voted him out too.
I didn’t tell you what to do.
Dewey, listen to me.
You're a good guitar player,
but it's the 20-minute solos, the stage dives.
(We're) trying to land a record deal here, man
and you're an embarrassment.

-Read between the lines, Theo.
Read between the lines!
-Dewey, man, I hope this doesn't come between us.
Like, I care about you, man.
-You guys, you know what?
You're nuts. You're all nuts.
You've been focused so hard on making it,
you forgot about one thing. It's called the music.
And I don't even care. You know what? So what.
I don't wanna hang out with wannabe corporate sellouts.
I'm gonna form my own band.
We're gonna start a revolution.Ok?
And you're gonna be a funny little footnote on my epic ass.
I feel sorry for you guys..