I don't know what a meme is but white suburban kids have been running around in backwards hats, reef flip flops and cargo shorts saying things like "whats up bro, hey bro, how are you bro, Brooooo!" since before the internet existed.
The video I saw showed two interracial teams. I don't know. There could have been some racial tension leading up to it but the video didn't show any, nor did anyone interviewed discuss any surrounding issues. Just the sign.
I remember playing black schools. They would always say shit like "I'm going to run your white ass over, I'm going to chalk the field with your white ass, I'm going to take your white girlfriend out tonight" blah blah blah. I played for Katy though, Texas HS football legends, and during a championship decade so we always won and it didn't mean much but I remember thinking wow! What if I threw "black ass" in to my shit talking? Undoubtdedly I would have been suspended, maybe kicked off the team and who knows what all if I said it just one time, vs. hearing it all game long, all season long. Not that it makes any racism right, just saying.
I know the whole racism/reverse racism thing is tired but shit, surfer/suburban lingo on a spirit banner just seems like a silly target for racism pundits to get all riled up at.