I've been an ASL interpreter for 40yrs & as part of that we have to take CEU's (continuing education units). Also, I work with Law Enforcement & live in a large metro area, so ALL of US are aware of gang signs so we don't accidentally throw one up in the middle of a convo that's going to get someone hurt. NONE of us have ever seen that "6" sign used as a White Supremacy sign: It IS a slang sign for A-Hole, Lol. So, if you cut somebody off in traffic & you think they're saying "OK", yeah, they're not. They're calling you a nasty name.