The "ok sign is a white power symbol" thing started as trolling on 4chan. It doesn't mean anything apart from being useful to infuriate other people. You're being trolled.
What evidence? That it used to be (and still is in many contexts) totally non-racist? I agree with that. But it's also been coopted (humorously, but it still is a rallying sign).
To this day, the swastika is still a religious sign in Hindu and Buddhist cultures. It also carries a nefarious meaning in other contexts.
I agree that a bunch of people from 4chan spreading misinformation online could be considered trolling. Taking it into the real world is a step I have a hard time believing. What would the troll's logic be? "I'm going to make all these suckers think I'm a racist"? That seems like an unusual step from anonymous online activity.
Trolling, at least in its original meaning, is not "spreading misinformation". It's saying things for the sake of provoking anger in other people that you despise or you just don't connect emotionally with. So it makes perfect sense to me for rightwing trolls to excite anger and confusion in leftwing people by appropriating a completely innocuous gesture and using it as a provocation. It doesn't really have to mean anything or to capture or express your true beliefs- the important thing is just that others will go nuts over it.
