People from overseas say Australians are racist, is this true?

I've heard people say aussies are racist. I'm a non-white Aussie and I repsecfully disagree. I grew up with multiracial Aussie friends and we all made fun of each other for everything (including last names and impersonating eachothers' parents' accents) I just thought it was a bit of fun and didn't care. Do we take it too far? Race is a part of life and sometimes it's funny to make jokes about life.