As one of those who "don't like the NFL", I can clarify my position a little...
I don't like most pro sports, not the NFL specifically. The reason is I don't like the entitlement mentality of its participants, nor the character of many pro athletes. I'm not picking on pro football.
I don't like that it's a job in which--esp. in the case of the NBA and maybe MLB--the "workers" most of the time punch a clock to get a paycheck. The objective is to play at two-thirds or three-quarters speed and get to the postseason.
But I understand that it's the gold at the end of the rainbow for our players. Otherwise, many of them wouldn't even be here at U of L. So, even fans like me have to support it to the extent that it benefits our current and future players.