Great. So if I posted somewhere that I liked that movie (I didn't), then someone is going to assume I'm really a racist.
Letting the fringes attach idiosyncratic meanings to otherwise innocuous images/numbers/phrases, then imputing those meanings to anyone else who uses those things, is ridiculous.
The thing about code phrases or images is that they are not meant to mean anything to YOU unless you are part of the clique which uses them. It's like Dopers with 420. If you aren't a doper, LEO, or school administrator, it's a number, a time, even Adolf Hitler's birthday, but for pot smokers, it's code for "time to get high".
You can ignore symbology like that, if you want, but if you have kids in school, it's best to know what it means, not necessarily to the general population, but in terms of things you might not want around you or your kids involved with.
With wider cultural concepts as well, it isn't about what it means to
you, it's about what it means to
them, even though not every instance or appearance of the symbol or 'code' will be anything but an innocent coincidence.
For instance, kids draw rainbows all the time. They're pretty, they are also the symbol God said he'd put in the heavens to remind us he'd never again destroy the world by water (Gen 9:13), yet that same symbol and color scheme has been hijacked by the homosexuals. Ignore the latter, and you may find yourself in a crowd that might not be a group you would normally exclusively associate with. But your kids drawing them in preschool doesn't mean they have thrown in with the GLBTQ crowd.