It was rude when I was a kid/teen too, and that wasn't very long ago. :) I have mixed feelings about spoilers-- I like them for episodes that haven't aired yet, or for series I'm not a big huge fan of. I like speculation and hints and solving mysteries.

I posted a trailer for Climax Deka on YT some time ago, and I still get occasional comments telling me how disappointing the movie was like I am somehow responsible.