I'm not a sports fan so I'm on the outside looking in, in wonderment. How does a person become a supporter/fan of a football club for which they have no plausible connection ? At my workplace, the local club is a Premier League side and I can count on one hand the number of fans among my colleagues. The other football fans support clubs such as Liverpool, Manchester City and United and Newcastle United. Yet, they are all locally raised and resident. One oddity is a chap who does support the local Premier League side but also has a Glasgow Rangers tattoo - he is not Scottish! Whenever I've genuinely enquired as to their support choices, I've received some peculiar answers, such as who won the FA Cup on the day they were born or the town where they first got their leg over. I kind of understand familial connections - my nephew was born in Middlesex yet supports his Dad's local side, i.e where he was born. One chap I've known for about a decade has supported four different Premier League sides in that time!
The explanation may be a lot more simple - glory supporters, associating themselves with a fashionable, successful club for their own self-validation. I wouldn't be so bold as to suggest this in person to these people - I have to work with them, after all - plus no one would be likely to admit it!