That's not indicative of a "strange" nature at all, because that's the attitude the majority of people takes: 'the human race/people from Manchester/blacks piss me off but I like my friends'. Show me someone who doesn't take that attitude, and I'll show you either a saint or a complete fiend. It's the strength of your revulsion for those not part of your circle of friends that puzzles me, not the fact that you distinguish between having friends and enemies. We all do that; we're all capable of overcoming prejudice when it benefits us socially to do so!