Earlier quoted context omitted.
That's exactly it. We find it so hard to understand how that joke is threatening. It's almost impossible to imagine. It just sounds like a dumb joke. But look at how Adria describes her feelings in the article: “Have you ever had an altercation at school and you could feel the hairs rise up on your back?” she asked me. “You felt fear?” I asked. “Danger,” she said. “Clearly my body was telling me, ‘You are unsafe.’” I…
The usual response to danger is flee or fight. She didn't flee. She didn't confront them. She shamed them publicly instead (which made it considerably more likely that they would take revenge physically instead). What is more likely, that she did this because she felt threatened, or because she felt like she could use her status to get back at the system? Not to mention the part where she herself tweets dick jokes.
Only Jews can tell Jew jokes. Only black people can tell n* jokes. Only a woman can tell dick jokes without shame?