Just how bad is Bruno?

I'm 14 years old, and i really want to see this movie. Also, I might add, I'm quite mature for my age and have already seen MANY R rated movies at my own home. Just never in the theatres. So, is my mom right? SHOULD i not see this movie? Tell me what the WORST parts are, and maybe my mom and i can come to a conclusion we can both be okay with.