Its not "how" and "someone", it's the cultural memes surrounding us and this particular person with no history of violence.
First of all , I still, after repeated attempts to explain it to me, have no clue about the concept of memes. It's gibberish to me.
Secondly, the basic idea of something being scary "to look at" implies there is no known history of violence. If there was, you'd simply call it scary and not waste time saying it was scary to "look at"
At any rate, if we have to categorize these comments as any sort of "isn" they are much closer to sexism than they are to racism.
And at least we can't blame this on Obama. It's all Dutch's fault.