Thats cool that Kut doesnt brag and flaunt, but to me, it's still not being "a fan". It's just choosing to root for the winning team when they are winning, easily put as "bandwagon jumper". The Patriots didnt have a broad fanbase till they started winning, now they have fans everywhere.
A "fan"... rides with their team whether its good or bad. We are invested in what happens, season by season, game by game. And even when it sucks (like Bengals fans).. it just makes it that much better when they do good.
Only thing worse I can think of... is people like my brother.. who will root for a team, then change his mind the next season, then again the next, based on what's popular. I still do not know how he can say he WAS a Bears fan, then became a Packers fan, but now is a Giants fan. Aggrivates me actually.