The username of this user is "Assh O. Le".
However, in his defence he has racked up 420 reputation and 19 bronze badges, so he's not without some merit.
Should this be allowed as a "humorous" moniker? Would we be overly prudish to disallow it?
Personally, I think this is going too far to be considered "funny". Actually, I consider it to be a broken window - I like things clean and tidy (basically everything Facebook is not).
I have evidence that "offensive" names do exist, for example, a real case a relative has seen while processing government paperwork is "Long Phat Kok", and I once did some work for the equivalent if the DMV and found three people with the unfortunate official name of "Mike Hunt", but this is not one of those cases - I don't believe the person is 94 or that this is his real name.