Dozy
Nigerians aside, you know nothing about the English!
You claim it is from the Empire they learnt this behaviour. However that by British standards would be considered shocking rudeness.
In fact the element of Nigerian culture that informs the comments here is exactly the opposite of Victorian British values that pervaded the Empire. In Nigeria it is considered praiseworthy behaviour to get as much reward as possible for as little effort as can be made. How could that have been learnt from the Victorian work ethic?
The people who run successful scams are looked up to. Note that current British culture does not consider lager drinking and fighting in Ibiza as something to be praised, so your comparison is not equivalent. If we did then that would be a reason to criticise Britain as a whole.
At one time I worked with one person born in Nigeria and another born in the UK but largely brought up in Ghana by his mother's family. Neither one had anything good to say about Nigeria; they had views in line with those posting here who have actually been to West Africa.
You are in fact making a generalisation about Britain that is wrong and unfair, when complaining about people making generalisations about Nigeria which appear by all the evidence I can see to be well-founded. At the very least you have no idea whether they are justified or not. As an old friend used to say, “pot this is kettle, colour check, over”.
Paulg
Stereotypes and generalisation are mechanisms the human brain uses to remember large amounts of information, by using the stereotype as a reference point. If you don't use them then you can only know a tiny fraction of what any normal human does, so are probably ill-equipped to comment. However since you can use a computer and write correct English with correct spelling then you do.
What do you know about the behaviour of the colonial administration? Why is it different from the known behaviour of the colonial administrations everywhere else in the British Empire? Why are you claiming that they are all have problems bad as Nigeria, with no reason to attack these other countries and stereotype the former colonies on the bad example of Nigeria?