The thing that complicates matters is that Casual Racism doesn't always have an intent, but the other thing about Casual Racism as I understand it, is that it has an impact.
For example, staying on the subject of names, there is absolutely an impact on the chances of getting a job interview depending on your name in the UK, someone with a name like 'Graham' or 'Simon' is far more likely in most cases to get a job interview than someone called 'Abdul' or 'Njembe', so much so that people have actually changed their names by deed poll to improve their chances of getting a job. This wasn't an intentional act by employers, as such, just an over-arching passive effect caused by sub-conscious racism.
I suppose, in summary it's the sort of thing that needs to be dealt with on a case by case basis, the way and time this was presented makes it a rather insulting sledgehammer bought down in the middle of a very sad event, and it's obvious that passions run high about the matter. This, from a cultural interaction viewpoint, is something we should at least be aware of.