Which logical fallacy is used in the text?
When Mason arrived at Heathrow Airport, a British man helped him retrieve his luggage from baggage claim. British people are all so nice!

 - hasty generalization: a broad claim based on too few observations
 - bandwagon fallacy: the assumption that the popular choice is automatically correct
 - slippery slope fallacy: the false assumption that a small first step will lead to extreme consequences
The text argues that a single polite British person indicates that all British people are nice. However, this isn't necessarily true. This illustrates a type of logical fallacy known as a hasty generalization.