Konichiwa,
While I don't condone his usage of racial slurs, you must also understand that when you spend time in hostile territory with people that want to kill you and they fit a certain profile or racial stereotype, it becomes much easier to use such language. Spend any time across the line from someone who hates you and you will learn to hate them back in the most simple terms you can muster, irregardless of your upbringing. Again, I'm not condoning it, it's not my style, but I've presented you with a different view that maybe you can take a look at, if not understand a little better.
While I don't condone his usage of racial slurs, you must also understand that when you spend time in hostile territory with people that want to kill you and they fit a certain profile or racial stereotype, it becomes much easier to use such language. Spend any time across the line from someone who hates you and you will learn to hate them back in the most simple terms you can muster, irregardless of your upbringing. Again, I'm not condoning it, it's not my style, but I've presented you with a different view that maybe you can take a look at, if not understand a little better.