If you couldn't find any examples racism, then you failed the test. As a white, middle-class person, you need to check your privilege and admit that you are incapable of understanding the kind of pain and suffering endured by those who have to deal with being triggered by the never-ending barrage of micro-aggressions inflicted by people such as yourself. You need to strive to be more like Margaret Sawyer, who took one look at that poster and recognized it for the racist propaganda that it is.
We now live in a world in which the mere hint of logic, reason, and rationality can be considered racist and intolerant. The sooner you get used to that fact, the better.