Jellby,
The rules are:
1. You may make fun of yourself
2. You may make fun of anyone who is more powerful than you
3. You may make fun of your equals, but be careful if you're making fun of differences.
4. You may NOT make fun of anyone less powerful than you. Not only is it offensive, it is not sporting.
Does that explain why you can make fun of fellow Europeans (rule 3) but not Africans or Asians (Rule 4)?
You may make fun of Americans under Rule 2.
Kate