Are you vegan as well? are you saddles and bridles synthetic? are you riding boots, helmet, chaps, etc. etc. ALL fake? If you say rodeos are cruel I expect you live a complete animal activist lifestyle, which I'm sorry to say SHOULD include riding horses. After all, we do use them for entertainment, i'm sure being ridden isn't always fun, there are people who are cruel to their horses.
Your young, so I suppose that's your excuse, but as you get older, you can't scream cruelty at every sport you don't like, and defend the ones you like as if they are the exception.
Also, I have yet to see a reason WHY you dislike rodeos. All you've said is that they ARE cruel because your friend has SEEN them. Have you seen EVERY rodeo in the world? did you personally see an animal be killed in the rodeo? From my experience, the people involved in the rodeo itself are very friendly; if you show any sort of interest in the sport i'm sure they would be glad to show you behind the scenes of what they do. Unless you go to the 'backyard' rodeos, you aren't going to find many places who will say ' no you CAN'T see what we do.' because really, that would cause more suspicion for them, and it isn't logical for them to bring that on themselves.