While the gesture is not positive in some countries, in certain parts of middle and southern Europe (although not in Spain or Portugal) the gesture is considered offensive. The connotation of zero or worthless is known in France and Belgium, while in some Mediterranean countries such as Turkey, Tunisia, and Greece, in the Middle East, as well as in parts of Brazil and Germany, and several South American countries, it may be interpreted as a vulgar expression: either an insult (you are an asshole), the slang for anus itself, or an offensive reference to homosexuality.
In the Arab world, this sign represents the evil eye, and is used as a curse, sometimes in conjunction with verbal cursing.
In some areas both the positive "OK" and the negative forms are practiced, which can lead to confusion over which meaning is intended.
In February of 2017, users on the anonymous imageboard /pol/ of 4chan set out on a prank to convince mainstream media outlets that the OK hand gesture had been hijacked for use by white supremacists to signal one another publicly. The pranksters claimed that the three upward fingers of the OK hand sign represented the letter “W” while the circle formed by joining of the index finger to the thumb leading down the arm represented the letter "P". The acronym formed by "W" and "P" was asserted to be shorthand for “White Power.” The original thread produced infographics explaining this usage concisely, which were subsequently spread to many different media outlets according to the Anti-Defamation League (ADL). The hoax began to gain traction when media outlets began reporting on the usage of the OK gesture as if it were, in fact, being used as a white supremacist hand gesture. Most of these media outlets have since recanted their statements, citing the official response from the ADL. The ADL has confirmed that the OK gesture is not a white supremacist hand sign.
https://en.wikipedia.org/wiki/OK_(gesture)