I'm actually fine with spoilers. I had a lot of bits with Undertale spoiled and honestly, it didn't bother me, I enjoyed the game anyway.

Having movies spoiled doesn't bother me either. Even if you know X or Y happens, you still need to discover how and why that is and what kind of significance it has on the storyline. To me, movies and stories are like a road trip and spoiling something means you just know what one of the stops along the way is about. But you still don't know what the rest of the journey is going to be like and when you're going to encounter that known fact. And the only way you actually do that and understand the journey is by watching the whole thing in full.