In all honesty, I don't think I would have checked a player's fingernails for messages. Wouldn't have even noticed it.
I've learned (the hard way) NEVER underestimate the creativity (in being STUPID) of the American teenager. That is something that EACH generation has to grow through, but this latest generation has been REALLY SLOW in getting through it. I'm sure it has a lot to do with the added toys they now have to play with, and the ever increasing tolerance they've been allowed to enjoy.
Unfortunately, each one of us is partially responsible (at least for our own teenagers) but also for allowing REALLY stupid behavior, that for centuries has sparked unnecessary confrontations that, all too often, ignite exaggerated explosions (that WE have to clean up &/or get blamed for). Coaches are often as totally surprised as we are to this "creativity" and the really DUMB/LAZY Coaches turn a blind eye to stamping it out, when it first starts, only to blame US when it causes an EXPLOSION.
Most of us were taught, often a hard way, by our parents (& their parents) the best/easiest way to put out a fire, is prevent it from starting or when it first starts, but for some, lessons learned are easily forgotten, until some "creative spark" explodes into a raging fire & it becomes OUR job to put the fire out.
We however, still have a choice, ignore that first STUPID remark/gesture and hopefully prevent a fire from starting, or let it pass & see how hot it goes. Either way,
we're likely going to be blamed for whatever damage it causes.