BLACK LIVES MATTER, or should we support ALL LIVES MATTER?

I saw a kind of social experiment on yt where a white person had written on a chart paper that Black lives matter and he stands in a white people area or something and when he asked people whether they support or not, some entirely ignored him and some said that one should not divide on the basis of colours and other aspects too and said All lives matter.

Then he wrote All lives matter on chart paper and went in a black people area and you know what happened???

He was attacked. 2 black people came and started abusing him, took off their t shirts and chased him.

Another dude came 3 times did the same.

When they were told it's a social experiment and there's the camara even then they didn't stop and just behaving like they want to kill that person.

One came and just calmly said it's not safe for you here. People are dangerous, you might get in trouble.

After watching that. I am here and posted this question.

/r/TooAfraidToAsk Thread Parent