He probably means there are a whole lot more serious issues in this world, and in your life, to get upset about, instead of going crazy over some very minor 'spoilers' for a fantasy show, so when he is answering questions and just tells a little bit about his role, suddenly he has thousands of idiots on the internet jumping all over him for 'spoiling' something.

I can understand why he feels the reactions are quite a bit over the top, considering it's just a TV Show.

It has nothing to do about being overly obsessive. We're talking about a guy who's upcoming film is John Wick 2. He's done voice work in movies like Kung Fu Panda. The guys gotten fat off of these exploitation movies. It's a little hypocritical for him to turn around and make these disparaging remarks, it is because of these roles that he has been afforded the opportunity to make films that he feels are more important to him. This is what I like to call the Hugo Weaving effect.

Hugo Weaving, after taking roles in films like LoTR and The Matrix and Captain America started to bad mouth these movies. He's pretty much all but disappeared from the public conscience now.