Skylar: Maybe we could go out for coffee sometime? Will: Great, or maybe we could get together and just eat a bunch of caramels. Skylar: What? Will: When you

Skylar: Maybe we could go out for coffee sometime? Will: Great, or maybe we could get together and just eat a bunch of caramels. Skylar: What? Will: When you think about it, it's just as arbitrary as drinking coffee. Just say "sorry, not a big coffee guy, can we go to X/take a walk in the park/eat a bunch of caramels instead?". The coffee is just a conversational placeholder, there is no spoon. As long as you immediately propose an alternative, you're fine.