If you are referring to the old "Nigerian Prince Scam" as to the prerogative of why you had to make this post, I would understand why you want to reiterate that not all Nigerians are scammers. However, for people who are smart enough to read between the lines, I believe they know as well that the email (from the Nigerian Prince) is a total scam.
I think this is the case hes reffering to.
Its so obvious scam that only really really really naive people fall for that. Theese emails are constructed that way, to only attract this kind of people, so there are spelling mistakes for a reason etc.
I read all about it, there is great website nigerian scam eater (this scam have number reffering to it, so like 420eater or smth) with many stories how he scam the scammers in a funny way.
To the topic author, i know not all people from a country are responsible for a group of people making scam. So worry not, nigerians are nice people too, like all people there are good and bad ones. Welcome to the forums, learn and be nice to others