Nothing new here people.
Many many countries have bias ATC towards their national carriers. Singapore is probably the most spectacular and bold of any I have come accross - expect to do laps out there so their Supers can do a low energy approaches.
As an aside and in the controllers defence though, it's my understanding it's often the computer software driving/overriding good controlling. Out here in Australia we have had a system TAAATS (think it's from France???) since around year 2000 and controllers are slavishly tied to what it tells them even when it would appear from their years of experience to be off the track so to speak. Whilst some aspects of the system are definatly good, on the whole controllers are now much more regimented and less flexable, efficient and practical than they were in the past.
So yes we all suffer from national bias in some countries but spare a thought for some controllers who are forced by their managers and policy to blindly follow what a computer has been programmed to tell them even when they can see it's plainly wrong but not necessarily unsafe.
Computers - rubbish in, rubbish programming, rubbish out.