Danny should you allow anyone to use a username that implies they work for a company after all it is pretty irrelevent if they do or don't. On second thoughts I think it is far worse if they don't. It doesn't take too much intelligence to come up with a non aligned original username.
Some people do actually take offence when their company name is hijacked in this way and I thought causing offence was something you discouraged.
I think your response was rather over the top and silly.