Lots of people prefer spectatorship (or outright fantasy) over action. Some people, however, are action oriented. People of the same type tend to mostly be friends with each other. This is why you get groups of overweight or skeletal people huddled around a table in someone's mother's basement, rolling dice and pretending to be Elves. At the other end of the spectrum you get groups of buff people huddled around complex pulley systems, sweating and paying money to pick up heavy objects and put them down again. These groups seldom if ever intersect.
Watching MMA, compared to training in a martial art that is a component of MMA, is a little bit like listening to a D&D dungeonmaster talk about what happens to your fantasy character while he's hiking up the side of a mountain. Sure, the fantasy is fun, but not as much fun as lacing up the hiking boots and doing it yourself.
It sounds to me as though most of your friends are not action oriented. Possibly you picked them up at a less action-oriented time of your life, or maybe you started out not action-oriented but changed. Now, you can share this cool new thing you found, but in order for your friends to get down with it they'll have to become action oriented. It's very hard for a person to change his or her basic nature.
You can lead a horse to water but no matter how much you hold its head under, you probably won't get what you want and eventually you have to start having a conversation about glue.
The upshot is that you cannot change your friends, and you're the odd one out. If you try, all that will happen is that they will bore you and you will terrify them. Better just enjoy them for their own sake without expecting much. They're nice people, but so are the folks at your martial arts gym. Make friends with some of them instead.