Furthermore even you have conceded that a person could conclude that they MIGHT be racist. If that is the case, then one should not DEFINITELY conclude that they are not racist either.
The thing is this, the human mind makes assumptions based on past experience. As a black male that grew up in a very racist area of the U.S., and area that to this day is a KKK stronghold, my experience led me to conclude that the cartoon is racist. Your background may lead you to conclude otherwise. However, you and others here are wrong to strongly assert that my perception is baseless when I have not said the same about your position. I would put forward that such narrow mindedness and lack of respect are why we continue to have problems with race in this country.