My best chum at RAFC in 1968 was a Pakistani AF academy chap on exchange. And I used to enjoy the banter with an Indian navigator chum who revelled in his nickname of 'Chart Wallah' - as did he.
Use the positive side of your ethnic origins to your advantage. 5 minute talk? Do it on Indian cuisine - and politely tell the 'red monkeys' that they know b*gger all about a good curry or whatever, perhaps.
There are far, far fewer racist bigots in the RAF than in civilian society - and even less than the media would have you believe! But political correctness has made even mutually acceptable banter a risk these days.
Don't worry about it!