I have the same thinking on these matters like most English people here. Most of us Asians don't really follow the club, we follow the league through that club. Let's say a big club gets relegated, do you think all these Asian man utd supporters will see Manchester United v Leeds in the Championship rather than Arsenal v Chelsea in the Premier League? same goes for the Barca and Real fans after some time they will get a 'new favorite club'.
And one thing is completely unacceptable for me is that when someone cares more about some foreign club then his/her national team. When a Dortmund fan from Dortmund says he/she enjoys Dortmund winning more then Germany then i get that, football is that way but when someone from countries like USA,Bosnia,Poland etc say that they care more about Bayen,Barca,United etc more than their national team then that is complete nonsense for me.