Honestly, the best course of action is to place him on ignore. Do not respond to it. Completely ignore it.
It perplexes me to no end, but it derives inordinate satisfaction from: lambasting the team, inciting the masses and then running over to the Gator forum to "brag" about it........
When he posts about Football on this site, 50+ posters attack him on his love of Richt and his Frost/Kelly prognostications, so he cannot post over there. On the baseball forum, there are 10 of us so he can withstand the furor. There is no point interacting with it. It is looking for conflict. When the team wins, he disappears. If enough people ignore it, then it may finally go away.