Yeah I think the important thing is regardless of the origin, or the order of events ... it is now sometimes used by white nationalists.

However I don't think that on its use on its own would cause a mob to mass report your account or anything. It's not so self-evidently a sign of hate as a hakenkreuz or the nazi salute would be, it's just worth remembering that in some rare situations it could be poorly received.

Always use the OK sign (to mean OK), even if someone else uses it to mean something else. Use it aggressively, always, relentlessly, as protest against bigotry and against language policing.

If you're going to use it "aggressively, always, relentlessly" then you may have to brace yourself for the occasions when you use it to someone from Brazil (where it's said to be a gesture along the lines of the middle finger) or with black-bloc counter-protestors near a nazi rally, or any other context where it's considered hateful or just generally rude. The Brazilian may just think you're an asshole. The black bloc guys will assume you are with the nazis who just hospitalised their friend...

This is what's important - it's not banned, it's not going to get you jailed. It's just going to land you in a tricky situation if you use it where it's going to be interpreted as a hate symbol.

What you do with this information is up to you.

It will land me in "tricky situations" only with assholes. The Brazilian will probably, like any reasonable human being, understand.

Well, good luck. You’ll find out where people’s limits are one way or another.

Every day we all must suffer fools, or those who choose violence to support their views, or both. Our choice as peaceful, civilized, thoughtful people is whether we choose to let them win. Violence and thoughtlessness are the enemy, no matter which side indulges.