It usually depends on who is saying these jokes and what their intentions are. Obviously if they are meant to be in malice with the intention of perpetuating or encouraging stereotypes and negative attitudes toward a particular group, then I'd say people have the right to be sensitive about it. But in general I either laugh at them or ignore them which I think most American also do.
I agree. Although the reason for making this poll was that some people point out racism in the wrong places. They ignore systemic racism caused by the war on drugs but point it out in harmless good natured jokes.
I agree, people do point out racism in the wrong places, just as people also ignore racism when it's actually present. Such is the case with systematic racism as you have already pointed out. But in some case these jokes are used to perpetuate systematic racism, usually through the use of stereotypes. Some people just don't seem to understand that jokes are not meant to be taken seriously.
Some Americans can be ridiculously hypersensitive about racist and other offensive jokes, but this group is by no means the majority or even a sizable minority of people (I hope/think). And then there are others who often make genuinely racist jokes, but these jokes are usually only told in company that wouldn't mind (other racists) and so the aforementioned hypersensitive group almost never has the opportunity to hear such jokes. Both groups are very small yet receive a fair bit of attention from the rest of the population.
I personally am not offended by racial jokes/stereotypes. For example in the movie Haunted House there is a scene where a black man is eating fried chicken, watermelon, and kool aid. When I saw it I just laughed.