As long as all you are joking about is funny stereotypes (like black people being on welfare, white people being trailor trash, jews being cheap, etc.), and not making fun of things like the holocaust, slavery or whatever then nobody should be that offended.
The world would be a better place if people could laugh at themselves instead of getting offended by every little thing.
Its funny how I have Asian friends that make racist jokes about themselves and love to have a good laugh...but one Asian friend in particular who is the most easily offended guy on the planet that you can't make any race related comments around. Some people need to lighten up.
P.S. On a side note why are there no funny white jokes (not counting Jew Jokes)? I mean there are some good trailer trash/redneck jokes but they are few and far between. All the good jokes are about Blacks, Hispanics, Jews, etc. but not white guys.