You're just a boy. You ought not to use language like that.
5 seconds sound clip from the Sling Blade (1996) movie soundboard.
You can hear this line at 02:03:46 in the Blu-ray version of the movie.
Quote context
[...]
- He's crazy. Sometimes I think it'd have been better off if I wasn't even born.
- Well, I'm glad of it you was borned.
- I don't reckon I'm gonna be out there in the garage no more.
- You have to, Karl. You have to look out for me.
- You can't let that son of a bitch run you off.
- You're just a boy. You ought not to use language like that.
- My daddy wouldn't let him do that to me and Momma.
- That fella's a whole sight meaner than me. He'd just whup the tar outta me.
- I'm real tired, you know that? A boy my age shouldn't be tired of things.
[...]