No, but abusing players of the team you "support" ? I mean thats probably the worst kind of support there is.
Kemy did also reply to some who tweeted that he didnt have a good game - and he acknowledged that by saying he will try to be better in the next game.
Defending the indefensible here.
I'd use the word "fan" loosely myself.
Of course i bet if the kid met Kemy face to face, he would shit himself. I certainly wouldnt want to get on the wrong side of him.