I hadn't heard about the upside down triangles either. But its disingenuous at best to claim the same symbol with the same color used by the Nazis to identify political prisoners was used in an ad about needing to stop the "far left MOBS". Exactly what alternate reason is there to use upside down red triangles in this context? If you can come up with a plausible answer, that would be one thing. But you can't.