Doug, this is not the kind of thing that occurs between adults.
5 seconds sound clip from the Fast Times at Ridgemont High movie soundboard.
You can hear this line at 01:19:16 in the Blu-ray version of the movie.
Quote context
[...]
- Boys, I'd like you to meet my wife, Mrs. Vargas.
- Hi.
- I wrote him a letter. Tell me what you think.
- Dear Doug. I received your message that you weren't coming to my graduation.
- Doug, this is not the kind of thing that occurs between adults.
- Anyhow, if you think I'm gonna sit around and wait for you, forget it. Sincerely, Linda.
- What do you think? I have another version where I call him an asshole.
- No, that one's better. It's more...
- I don't have to sink to his level. I can go out with anyone I want, practically.
[...]