What a strange thread. You can't accurately judge whether a person is boring or not based on what sports they do and don't enjoy. To claim that everyone who likes American football is boring is, well, it's nuts. One would have to meet every fan of American football to reach anything approaching a realistic conclusion, and even then it would still remain nowt but a subjective opinion. And it's the same with cricket, if everyone who likes cricket is dull then does that mean almost everyone in India, Sri Lanka, Jamaica, etc. is dull? It's an absurd proposition.
Personally, I find American football incredibly tedious, but is that because it is tedious or is it because I'm blind to it's qualities? Who knows. And who cares. If people enjoy the sport, good for them.