How often do you listen to/watch/read something a friend has recommended to you and tell them you like it cause they think it's the best thing ever but really you think it's total shit?!
Never. I wouldn't lead anybody on like that. At most, I'd say "Interesting," or make a neutral remark on the general theme of the thing, thereby acknowledging the context of the thing.
How often do you see comedy in your own failures and you're glad to laugh at them?