I might have missed it, but I only saw the video of the one against the Chargers. It looked like he was gesturing towards the Chargers QB, which I can see as being worse. We'd need to know why the NFL accepted the appeal on the first violation, and what he was told.
And, for the record, I'm not anti showboating or swagger. I love nothing more than a batter smoking a home run and showing some flair coming out of the box. EDLC smashing a 450 foot homer with an exit velocity approaching the speed of sound deserves some flair. Everything has to have limits, however. I assume the no blazing guns might be an offshoot of penalizing players for throat slashing gestures? As others have mentioned it is a violent game by nature, but if there are guidelines players can be pointed to, then the need to abide by them.