I don't understand why you think people who don't want to know about episode events before they happen are being selfish but people who do want that are somehow being altruistic or something?
Both sides are being equally selfish in that instance. Both sides are trying to force the other side to abide be their beliefs. Trying to paint one side as heroes there and the other as villains when they're both doing EXACTLY the same thing is just dumb.
Ah, so it's okay to be spoiled then as long as the studio is shitty at making previews. Good to know. Very quantifiable that.
It's hyperbole. Nobody watches(watched) Breaking Bad previews, and nobody tolerated anyone around them discussing them in earshot either.
And I'm sorry if you care so little about the people you are so desperate to discuss a thing you both enjoy with that you don't care if you're making the experience less enjoyable for them in the process, because the 15 second clip at the end that has no relation to the actual episode you just watched simply cannon pass without comment.
It's insanely irrational and egotistical to insist that, in an discussion about things that happened in the current episode, that the preview(which is a collection of things that happen in the NEXT episode) has to be discussed as well.
Episode previews in the constitution? What the fuck are you babbling about?