I have a feeling your're exaggerating the situation, but anyway...

Plenty of people want to experience fights blind, and I see no issue with this. Plenty of streamers also have the "no backseat gaming/spoilers" rules, too which are perfectly reasonable. I've seen plenty of people in twitch chat unable to respect two very simple rules, and be reprimanded as a result. This sounds more like a "you" problem, OP, if you can't follow such a simple request.