I’ve based this scene on something which happened to a friend of mine.
This is a (comparable) mild(?) scenario. But if you witness a actual hate crime during public transport, there is some stuff you can do. There’s [this great comic by Maeril] going around online, and [this episode of Canadian podcast The Big Story discusses it as well]. The public transport in Stockholm has [a phone line if you feel unsafe]. But if there’s a dangerous situation, you should always call the emergency number instead. Take care of each other and stay safe.