- This bum gotta say that?
- Who're you calling a bum?
- I'm calling you a bum!

4 seconds sound clip from the Rocky (1976) movie soundboard.

You can hear this line at 00:32:01.510 in the Blu-ray version of the movie.

Quote context

[...]

- Who's this girl you're going out with tomorrow night?

- How'd you know?

- You know. Don't you think I hear things? A lot of canaries flying around the docks.

- I'm going out with Paulie's sister.

- Hey, Rocky.

- What?

- I hear she's retarded.

- She ain't retarded. She's shy, you know?

- I'll tell you what to do. Take her to the zoo. I hear retards like the zoo.

- This bum gotta say that?

- Who're you calling a bum?

- I'm calling you a bum!

- Okay, relax. Relax. Buddy's in a bad mood. It's his prostate.

- He's always in a bad mood.

- You know, you oughta count your blessings, Buddy. You're still a healthy person, you know that?

- I don't like your face.

- I don't like yours, either!

- Kiss my ass!

- Move your shoulders down! Get out of the car!

[...]