Keep plugging away, still a good chance he’ll see the light at that age. My lad did (around the same age). How you realise most of the slating was pisstaking...........
Apart from the stupidity of the question in the first place, game will be a sellout, so he’s also depriving a BHA fan of a seat.
Let him wear it, and let him cheer when Chelsea score. The dogs abuse and then being chucked out will be a good lesson for him.