And yes, it was a symbol as well as a reality. Here is a noose carried by a Klansman to threaten Black people and keep them from voting in 1939 [1]. Here is a mock lynching at the University of Mississippi in 1962, to scare off the university's first Black student [2]. Black men at work would find nooses at their stations [3]. Nooses were mailed to NAACP Secretary, and in 1956 a noose was hung in a schoolyard tree during a battle over desegregation [4].
You said yourself you're an "outside observer of American culture." Well, this is a history lesson. The noose has been an extremely potent symbol of terror for over a hundred years.
1. https://www.shutterstock.com/image-photo/masked-ku-klux-klan...
2. https://cdn.cnn.com/cnnnext/dam/assets/200623111206-noose-do...
3. https://www.adl.org/media/10204/download
4. https://www.latimes.com/opinion/op-ed/la-oe-shuler-noose-hat...
https://www.espn.com/racing/nascar/story/_/id/29345568/nasca...
It's disappointing how explicitly and consistently HN responds to discussions of slightly-subtle racism with a very explicit not-at-all-subtly-racist pretension that it doesn't exist. "It doesn't bother me therefore it shouldn't bother you" and "You should look at the context", as if being black isn't a context.