Financial Institutions do not have "double standards" in the way you mean it. They have profiles outlining who they will lend to and who they won't. It is their prerogative to do so.
They are in the business to make money, and if you're a customer who will not make them money they will not be interested. Their credit scoring system is a neccessity for the banks... it protects them from bad debt - they simply can't treat everyone the same. In most cases this actually helps the customer and the bank (people with good credit histories get better rates for example - the alternative is that everyone pays for those who default!).
In the last few years customers have become more canny in terms of credit cards, thanks to people like Martin Lewis. They exploit the credit card system and competitive market and the profits of the institutions has dropped as a result. They have combatted this by creating a profile for those people who are likely to expoit their system. In Rocky's case he's matched that profile and this girl he knows - for some reason - has not (there's no way of knowing what caused this).
so it's not double-standards - it's just the way it is.