It's more than understandable not to like it, and there's a bunch of contexts where the OK sign was(is?) widely and helpfully used. However, this is how language works. Meanings are defined and are changed by everyday usage. If you have a bunch of white supremacists actively using a previously innocuous symbol in order to "troll the libs", the meaning of that symbol may become indelibly associated with white supremacism. It should be interpreted as such if it is intended as such.