Talk about digging up an old discussion!
It is never difficult talking about roller coasters with non-enthusiasts friends, as long as you realize the right context to talk in.
For instance:
What I would tell Snoo, a roller coaster fan: "Diamondback is one of my favorite hyper coasters because it has great floater airtime and a fantastic first drop compared to other B&M Hypers."
What I would tell other friends: "Kings Island has a roller coaster that is 200 ft. tall, similar to Magnum at Cedar Point. But, it is also smooth like Millennium Force, which makes it a fun ride."
Same message, different examples.