You have been deceived, indoctrinated and manipulated!
The truth that the globalist fascists, disguised as liberals and radical leftists, want to hide! What an elucidative and enlightening experiment!
Before a poster saying "Black lives matter", there is not a single adverse reaction from white people and much less aggressive! Whites just duly point out that all lives matter, regardless of race.
Before a poster saying "All lives matter", the reaction from blacks is to immediately start aggression, leaving the physical integrity and even the life of the demonstrator in danger!
The stupidity of some blacks is so great that one of them, before the poster saying "All lives matter", even asks: - "Black lives don't matter?", - not even realizing that the superordinate concept of "all lives" includes/comprises the subordinate concept of "black lives"!