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.