Some people seem to think this isn't a big deal, or that it's coincidental, or that it's acceptable for these non-overt symbols to be used...
But hate groups prey on young people by exploiting a sense of trauma, disappointment, and resentment and they do this through the use of symbols and exclusive clubs. The very idea of "meme magic" and the duping of others through hidden symbolism is meant to indoctrinate.
"This special symbol is just for us, we're better, we're more enlightened." That's the poison that's being spread here. Some kid is going to see this and feel that all of their secret beliefs are validated, everything the older kids on the message board told them must be true, here's the proof.
That's dangerous.