I would do the same thing. The whistle is the power of stopping and starting the game and to have that little twirp blowing it on the sidelines shows he is a little *itc* and there should be a penalty. No different than throwing something onto the filed.
I guess there was people all over the place doing that.
Besides that. The saying is that the fans are part of the game. If they think they can get away with crap like that at a home game then they can suffer the penalty against their team.
There was a fan who ran out on the field at the chiefs pats game. 15 yards against the Chiefs.