He loves his football, but he's a Jets and Giants fan. :)
If you're a football fan yourself, you might enjoy his football-related posts on his blog. I absolutely love them - he is knowledgable, opinionated, passionate, colourful. It is very good reading, in other words! He didn't post much about football this season, unfortunately, but I hope he'll be back to his old NFL-obsessive ways soon. If Sam Darnold starts turning the Jets around, and if Eli Manning hangs up his boots, GRRM will have plenty to say about it, you can be sure!
And welcome to the forum. :)