There are a few types of people when it comes to subjects like this;
Person A, Have a quick laugh for what it is and move on.
Person B, Gets on their High Horse, cry's racist and starts banging their keyboard demanding jobs be lost.
Person C, Is a racist.
I'd like to think that the person who lost their job is person A like myself. I am by no means racist and have zero hatred towards other ethnics but I do like crude humour sometimes. I know banter like this exists in a lot of social circles.