As an American, I don't really expect people from other countries to think much about 9/11 when the anniversary rolls around, unless they lost loved ones that day. Because of the way our media works, I'm not all that surprised that there's a sense that other countries would feel "pushed" to remember the day, no matter how Americans themselves might feel about that. I do think that the 9/11 attacks take a pretty prominent place in terms of their sheer scope, and their impact on the events of the last decade internationally, but that doesn't automatically lead to people who weren't directly impacted by them keeping them in mind.
The thing is, while we did get extensive coverage of the 7/7 attacks when they happened, and I was definitely aware of them myself, I couldn't tell you what the date was until this controversy came up, or what year they happened until I checked Wiki. By the same token, though, I couldn't tell you either of those facts about the Oklahoma City bombing without also looking them up. It's interesting how the way in which events impact you personally, and how they become part of the overall culture, affect things like that.
