It didn't take much thought to say "no". Difficult is not the word I would use. Difficult means hard-to-do. It's not hard for me to be a Bills fan - takes no effort at all really. It's pretty much ingrained in me and has been a big part of my life since I was old enough to remember. I think it would be difficult for me NOT to be a Bills fan.
A word I would use instead would be frustrating. Draining. Maybe even painful. Those of us who have been through one or more of the "up" times (mid 60s, mid 70s, early 80s, most of the 90s) remember just how euphoric those periods are. It's almost like gambling - the hope of another payoff like those keeps us coming back, even through the pain of loss.
And like gambling, you find ways to make those losses less painful. You bet less until it turns around. You curse the "gods". You blame other people at the table. You share the pain of a dealer draw to 21 with the people around you. You tell yourself that if you lose 2 more hands you'll get up and take a break, and then self-loathe for not getting up sooner. You enjoy other activities at the casino for a while.
For those who have not experienced the good times, I understand. You don't have the joy to keep you in.
But then again, maybe you're sorry for me not being able to break away.