Even if it is meant as a troll, it is still a way to signal kinship, among folks whose views are not exactly a secret.
Haha, only serious...
Hence, ultimately, a racist (if layered) symbol in this context. It's not been flashed as a joke by non-racist people.
Trolling is a meaning. I think in that situation it’s even more ambiguous since the “troll power” is so much greater then.
I think it’s unambiguous that the user is a shit-stirrer certainly, probably an asshole. But not necessarily racist. Or no more so than your average run of the mill “everyone is racist subconsciously” racist.
I think what’s hard is that it’s a negative thing to do that brings more chaos and harm into the world. It could be racist/white power that is super bad, let’s say 100 on the bad-o-meter. Or it could be trolling the pearl clutchers that is mildly bad, let’s say 11 on the bad-o-meter. And for scale, punching someone in the face is 200 and murdering someone is 1000.