When you've grown to become an adult, a lot of things become uninteresting and you might find out that from the comfort of your home, almost all the things you want to do as fun can be done at home. And note that this is not just about football. If you're a fitness person, you will know that doing fitness outside in an organized body building mall gives you more fun than buying a trade mill and all the dumb bell and having to do all your exercises by yourself. I've got my TV at home and I can afford to watch the United Chelsea game all by myself but it's not as fun as watching it at a beer mall most expecially on weekends when you're off from work.
Watching football games is a fun activity and not something you should be hiding while doing it. A bottle of drink while watching your favourite game wouldn't cost much.