It was actually Kiyowhatever. He said it to challengerX, and I hate that fucktard, so you know something's wrong if I'm defending him.
Nobody cares OP
Your two scenarios are a little different. If someone asks you, specifically, what they should wear for a party, then they are waiting for your response. On a public forum, the question is usually asked in general, to no specific individual, and so there isn't any expectation for you to reply.
I don't see what's wrong with that logic. Don't give a fuck? Then stay the fuck away. If you're not adding to the thread, don't bother. No one cares about some random person not caring, it only impedes discussion and no one gets happier by it.
It depends on the topic of the thread. If it's spam or a really shit thread, it's okay to post "nobody cares". Otherwise, you need to shut the fuck up.
I don't care about your string of care?.?!.?How do you think of stuff like this?