You didn't have to post the video. The fact that it is being amplified by white racist supremacist sites is exactly what nobody wants. It is garbage and is better ignored and left to die.
The OP didn't post the video at first. But people thought he was lying, so he showed evidence. Then you attacked him for defending himself and accused him of complicity.
There is no "you attacked him for defending himself and accused him of complicity" going on here. Everybody has a personal responsibility w.r.t. communication in public forums like this else it can easily degenerate into a cesspool of hateful internet filth.