I actually think the FA did the right thing. A plane is a public forum, and like it or not, we have to watch out for everyone's sensibilities. If you were that upset, you should go home and just find out the ending on the internet. Let's face it, no one was really hurt by the fact that the show was ended, and Delta got to make a passenger happy.
Actually, I don't believe any of that, but the incongruity of seeing a thread on FT in which agreed was getting my OCD agitated. I feel much better now.
Mike