That's completely fine until you start brigading and going in the comments and bitching every single time.

There are certain things I don't really like seeing much of. Because I'm a mature person, I simply block the subs and the user's that post it out of those subs.

It's also not genocide, it's not unethical for everyone. Some of us have opinions that are more complex then regurgitating what copyright companies told us to think. For example, stuff like reposting is way more unethical but you aren't actually thinking, grow up.