ehhh grown may be a bit subjective here and you will see why at the end of this comment.
However, with JG I dont think you can take that part of the game away from him. It legit is who he is (emotional) but I do think you can confine it to your own sideline. He did the thumb down gator chump multiple times. I thought at one point it would be a flag on some BS like how the upside down horns for texas was considered taunting or unsportsmanlike.
I was at the game 10 rows behind our bench. JG was jawing as soon as he was on the field and was getting in the DBs heads/ Refs did a good job separating DB/WR a few times after the whistle blew. I saw where he got hit and he did show restraint in not retaliating but it was after JG had already baited him multiple times.
Then late in the third JG was barking at gator fans in the stands lol **** was hilarious to the point some GA or whatever walked by and grabbed him and spun him around. Lasted about 30 seconds he turns back around, chirps more, then it was time for offense to come on the field and he did the chomp at the gator fans who he was chirping with then did the Marshawn Lynch nut grab backpeddaling onto the field.