How do we stop the selfish manga readers from ruining the anime viewers experience?

[Rinko]

I have been thinking about this for a long time now and I don't have a good solution. Many people spoil the fun for anime viewers and I don't get why they have to read the manga just to spoil other's fun

 

[Burnsy]

Here I'd just hit them with the ban hammer.

 

[Grungie]

I'd just not hang out in a place where people are spoiling that particular show.