I don't see much controversy about him hushing the fans. He's been heavily critizied and his emotions got the best of him when he scored, it's a natural reaction to want to silence your critics when they are proven wrong (in his mind they were proven wrong as he scored a goal).
Anyway, just another piece of evidence that he is a rigth winger and not a right back. Watch him play as a right back and you'll see him constantly looking left,right trying to see where his teammates are in order to position himself accordingly. He doesnt have that "feeling" of how a back line moves so he has to turn his head and see it. He just doesnt have that "defensive instinct". Would be just another Aleix Vidal