I agree that it's different, and people often have thinner skin than they claim to. Yes, people were irritated that people were blocking them, while simultaneously not reviewing their own behavior and considering why that user would have blocked them. The chat room issue was one thing, but people would whine about being blocked in a topic on the forum as well. Indeed, showing who is blocking someone is a bad idea for a forum. That forum should have changed their code so that it didn't create unnecessary drama.
Unfortunately, on yet another forum, I have seen people react to seeing how people reacted to their posts.