[Liam-]

Originally Posted by Oliver_W

My tablet's sound is broken so it's hard to get context - how do you know he was a white supremacist, and how do you know it wasn't just the OK symbol?

From a database of hate symbols and signs

https://www.adl.org/hate-symbols?cat_id%5B153%5D=153

A common hand gesture that a 4chan trolling campaign claimed in 2017 had been appropriated as a symbol meaning "white power." Used by many on the right--not just extremists--for the purpose of trolling liberals, the symbol eventually came to be used by actual white supremacists as well. Caution must be used in evaluating instances of this symbol's use.

So when used in the context with a known white supremacy group, it’s pretty clear cut