For example back in 2020, in Minneapolis: George Floyd was killed by a white cop which sparked a worldwide protest regarding the BLM movement. That was a high profile one. However, before that: there are cases of “black kid gets shot for holding toy gun” or anything equivalent.
The UK is nowhere near perfect. It still can be scary for minorities. Police brutality does exist. But incidence per capita is considerably lower and the incidents that do occur are considerably less deadly compared to the us. The UK is more tolerant to minorities, but still has a lot of work to do. I’ve lived in the UK my whole life and have seen it gradually improve over the last 40 years, but I’m looking forward to seeing it go further. There are guns here, but not like the us. Police don’t carry guns generally and the vast majority of the population aren’t allowed to own a gun. Only highly specialised police units get guns and they get wheeled out as a last resort.