Is this Joke Racist ..I come from a mix race background my Dad is German and my Mom prefers the 100 meters...?

I want to use this in a audition I'm doing sunday ..I'm going to go in dressed as a lady as well ..oh by the way the audition is for a local radio station...So it goes I think I should get the Job ...I come here to day representing three of the main Ism's casually used and i want to have them stamped out ...Sexism ..I'm a man and if I am the right Human foe the job I should have it not as in most breakfast radio shows 1 man 1 women presenting. Ageism I'm 38 I know I'm getting on but its there once more ..And Finally Racism ..I come from a mix race background my Dad is German and my Mom prefers the 100 meters....So colour or creed should not count!!